I feel like they will keep the Switch around for a long time, i think it's safe to say the floor is pretty much 130 millions now.
It will definitely sell over 20 millions this year. First half of 2021 will be really strong, it has great momentum currently and has system sellers and special edition in the coming weeks/months. Then seeing how well packed first half is and how Nintendo didn't shy away from keeping H1 somewhat blank, it means they don't have much space for other months in H2. It's pretty obvious some price cut or revision (or both) will happen to.