I think the PS5 will get close to 20 million units sold in 2021. Having titles like Ratchet and Clank: Rift Apart, Gran Turismo 7 and Horizon Forbidden West hitting in the calendar year for PS5 will push hardware tremendously.
I don't see God of War Ragnarok or Final Fantasy XVI hitting this year though. So that will leave some ammo for next year.
As for the game that I'm excited for, Ratchet and Clank: Rift Apart.