Yes, a higher MP for the R3 would indeed be valued by wildlife and BIF photographers, and probably sports and reportage photographers too.what a pity for birders. I´ll stay with my R5...
But what is following? R1 with 20MPix, as professionals do not need more?
I hope for an high MPix R5 or R3 for birders.
But R5? Seriously? You need more than 45MP?
I see the "R5s" with its rumoured 90MP as being a studio, advertising and landscape camera, not a sports or wildlife camera. It's unlikely to achieve more than 6-8fps.