I doubt Monster Hunter will ever go to Nintendo. That would make too much sense. Hopefully Capcom at least has the sense to go multiplat and make the next MH from the ground up also on the Switch.
If BotW2 isn't ready for the holidays I wouldn't be surprised if that rumored Mario Collection is the main promoted game. Maybe with a couple first party ports mixed in, and more big third party ports now that 2020 is already the biggest year for Switch third party ports. If no BotW or other mega game, I'd love to see holiday lineup be 3D Mario Collection HD (64, sunshine, galaxy1+2 would be amazing and would be a guaranteed 10 million seller at full price), Wind Waker HD, Metroid Prime Trilogy HD, some new Nintendo AA title, along with a few big old third party ports and a few new AA third party games.