It will happen. They will re-release 90% of the Wii U games on the Switch.

1 million by itself or 1 million with Wii U + Switch?

I don't think the former will happen but the later should happen easily. 
They should port to make some easy cash. 

I think it's inevitable that they'll port it to the Switch (Or at least I hope so!). We've known for a while that Platinum is making something for Switch but they still haven't said if it's a new game or a port. For all I know it could easily be a Bayonetta 1+2 bundle. If it's not that, I'd gladly accept Bayonetta 3, too ;)

I wonder how many people still think it's coming to non-Nintendo platforms.

Yeah, if it could nearly reach that on the Wii U, I figure it would be done quite easily on the Switch.

Would love Bayo on Switch!

I'd be happier to see Bayonetta 1 than 2.

In addition to Bayonetta, this might also do Wonderful 101 some favors...

I think they should do a new Bayonetta project in the vein of DmC, kinda a reboot kinda not.

Bayonetta 1+2 remastered would sell well, though it might struggle to break 1 mil, even on the fast-selling Switch.

If Nintendo and Platinum decide to do a Bayonetta 3 build from the ground up for the Switch however, that could easily break 1mil.