So if USUM is 2017 game and Switch game (most likely gen 8 since all gen 7 mythicals are out already) will be 2018 as this source says https://twitter.com/GoNintendoTweet/status/877615247196127232

then does that mean there wont be gen 7 Mystery Dungeon game? Unless they'll release it lets say next spring there's no way they'll have gen 7 one before Switch main game launches next year

I also wonder if it would happen would it be Switch or still 3DS. gen 5 MD game launched on 3DS and it didnt work all that well. Maybe they should release last 3DS MD game early next year and take their time with Switch MD game in the future. Super Mystery Dungeon wass amazing and they can reuse all the models for gen 7 MD game