Why Pikmin should and will never get a night mode

No Onion does not always mean no Pikmin. Look at the cave system in Pikmin 2, you bring your Pikmin far away from the onion. You may say "well it is still on the surface," and to that I say, the Pikmin who are away from the onion are eaten at night. There is no magical force making a Pikmin go to the onion otherwise this wouldn't happen. So yes, the onion would leave, but the Pikmin you have with you could easily work the same way as caves in Pikmin 2. You have a set amount of Pikmin to do your job. Yes, it would be more dangerous at night, but the game would offer different challenges during this time.

Being able to stay over night in story mode would ruin the sense of urgency and basically it would make the day meter unnecessary. If there was a challenge mode where you outlasted on the surface of an area through the nights, that might work.

You guys keep saying that night would ruin the game because the sense of urgency is gone.
Well first off, the caves in Pikmin 2 gave you unlimited time. The limitations were the amount of Pikmin you had. If you lost too many Pikmin, or a certain type of pikmin, you may not have enough to get all the treasure in one go. This proves that time is not required for a game to be a RTS. This is not what the "Time" in "Real time strategy" is. Real time strategy means that a game isn't turn based, not that there are time limitations.

That being said, you also seem to think that day exploration and night exploration would be the same, which is also not necessarily the case. Night time wouldn't just be harder, it would be a different game-mode of sorts. Look at the game don't starve. During the night although you can do some of the same things, it requires you have light. This alone gives much more of a challenge, and requires you to think differently and play differently. And just so you know, Don't starve does classify as a real time strategy game.

What are you talking about it would strengthen this aspect.
The point is to get more done during the day so that you can be prepared for night.

Night travel wouldn't work the same as the day. And it wouldn't just be the same thing with more enemies either. Look at Metroid Prime 2 for example. In that game when your in the shadow area, your mobility and the things you can accomplish are severely limited, and you have to rethink how you can alter things. Heck they could add in something where doing something that you can only do at night would benefit you during the day or vice versa.

It wouldn't be the same thing as day at all. The onions would go away so it would limit your pikmin, just like caves. There would be more enemies, just like caves. You wouldn't have free reign in the map at all, heck if you saw my post I'm thinking it may just be protecting the landing base not not being able to go anywhere else. 

So while you have daylight, you need to think: What sprays should I collect for night, what pikmin should I grow, what treasure should I collect, what enemies should I defeat now so that they don't bother me at night, ect. It would do exactly what your thinking of, see how much you can get done in the day, so that you can be prepared for night. The night would even make you want to move faster during the day, becuase if you don't get enough done, you've got to go through the night in that area again. 

By applying what you just said would mean that the caves in pikmin 2 weren't a good idea. 

You said Pikmin has always been about what you can do in a day. 

Caves have unlimited time. Also, "its always been this way" is a terrible argument. What I've said doesn't actually change much at all.

You think the system can't handle running a day for a extended period of time? Look at Xenoblade Chronicles that game has night/day patterns and a vast open world and runs on the wii. Pikmin 3 is one of the lowest processing burdens on the wii u. Having a day last for an extended period of time doesn't burden the system at all. This point is really coming from nothing.

Transition between areas would still be a thing. After making progress during the day or beating a certain boss you could unlock a pathway to a new area. That isn't a hard thing for Nintendo to accomplish with a little thought. 

I was only relating the concept to those games. I could relate fundamental concepts between any game ever dude, that's a silly thing to say.

Aside from those the only point I could really pull from this aside from "It wouldn't be good." Can I please have a reason why not having night mode would "contribute to gameplay?"

Okay first of all the second you leave a cave and go back to the surface the Sun Meter is exactly where it left off, it's not comparable at all. In order to be able to stay in an area when it's night time would indeed alter the complete strategic balance of the series. It is something that should be resorted to a specific story event and a unique game mode, not something that you can choose to do whenever you want.

The only 2 things that would make it possible is if PikFan123's idea was integrated and if once the 13.5 minute long day ends, it slowly transitions into the harder night (along with a warning that night is approaching) so players with less skill can get back tot he onion BUT that would bring back the issue of ruining the time limit. I just don't think a night mode would work if it was directly integrated into story mode.