My first thought after CK3 was announced was - hey, I have only ~200 hours in CK2 - I didn't play all the regions, get all the achievements, ...
From devs perspective, delaying CK3 was probably harder and harder. CK2 seems to be like wine - getting old in very good way, so actually I accepted the announcement and hope for the best.
I think the same happened with Civ5 → Civ6... (also in terms of more childish portraits...)
Vicky 3? By pure extrapolation, looks like they're working on it since 2015

. It's going to be big. And full of sliders!
btw - I really hoped for "One more thing" announcement...