Frankly I don't think it's worth it in any fashion to try and work the games onto mobile platforms. It's cumbersome, time consuming, and doesn't have a great return potential financially.
Putting their efforts into expanding the current game is more important, to be frank.
That being said, with the current plan to use NPCs from this game to make spin off games, I think it's entirely plausible that post launch we'll see some games geared for portables that take place within the Yooka-Laylee universe.
You're assuming everyone on earth is going to buy a console version AND a 3DS version. Not the case.
It doesn't matter what your opinion is. It's abundantly clear you have no conceptualization of how much effort making a game is for even ONE current-gen platform. Dumbing it down to outdated MOBILE platforms would literally require an entire second studio to make an entire "second" game. For the same game they're already releasing.
It would be spending millions of dollars and hundreds of man-months to shove out a game to a TINY market share. How much crossover do you really believe there is? Not many people besides users here are going to buy this game on more than one platform. I bought it on 3 platforms. Most people will choose one and be done. After a point you hit diminished returns when comparing sales to publishing fees by adding additional platforms and honestly they may be at that point already with six+ launch platforms.
This game can not be even a New3DS title without completely rebuilding the game from the ground up for that platform. The 3DS is not powerful enough.
In all regards, while 3DS would be great, it takes too much time, effort, money, and would most likely be a dumbed down version. I think we should just be happy that we already got it for xbox one, wii U, ps4, pc, linux, and mac