Hey, don't underestimate what good makeup can do.
Not true, there's definitely room to grow. 36mp on f/4 at m4/3 just about hits the diffraction limit, for example.
That's a good question. I personally think it might be one step too far, but that's what many said of 4K vs 1080p Full HD, so who knows? Prognostication of this level is difficult, so I'm not going to attempt it. ?