Originally posted by biz-engineer 2016 : Full frame 36Mp
2017: Apsc 24Mp
2018: Full frame 36 Mp
2019: Apsc 24Mp
2020: Logical progression => Full frame 72Mpixels (2 x 36 = 72)
2021: Logical progression => Apsc 48Mp (2 x 24)
Don't know why a 72Mp FF or 48Mp APS-C is a 'logical' progression. There are several updated cameras which didn't increase MP counts - Canon 1Dx Mk III has same 20Mp as prior model, Sony a9ii has same 24Mp as prior model, Nikon D780 kept the same 24Mp as the D750, etc. Nikon D6 is also rumored to keep 20Mp.
I could see a Ricoh full-frame DSLR using the Sony 42Mp BSI sensor that has been out a couple of years and might be available at a good cost. And the only rumor for the APS-C replacement due this year is the Sony 26Mp sensor.