I am not sure if multile projects is their philosophy. Marcin said "we are not releasing every year" . He also said he doesn't want to make a soup opera that lasts and lasts untill you are fed up with it. They do not want to make another Assassin's Creed serial. They want to focus on Cyberpunk now, and quality which they are"obsessed" about. So the next thing they release after Blood & Wine will be Cyberpunk, and that will be next year most probably.
Right. As mentioned above, I said that TW4 will most likely come out along-side a CP77 sequel. So, it will be CP77 (And the other R.P.G. they're secretly working on.), then CP77's sequel (Or another game, if they decide not to turn CP77 in-to a series.) and TW4 (Together.).
What I was getting at is that the days of C.D.P.R. making one game at a time are gone (Which, as Dragon mentioned, is a good thing.). Now, we'll probably be seeing two releases every four years, rather than just one.
Also, considering how they haven't actually started working on CP77, yet (At least not big-time.), it probably won't be out for another three to four years. It can't possible be coming out next year, as you mentioned in your post.