Pentax are going to release a 61mp monster shortly - the K-1 Mark III.

Problem is, it will come with a big price tag and the ignominious fate of having to use a Pentax.
Frankly I think they are making a step the other big hitters should have made long ago.
Professionals have PCs that can handle these files now. Just because it may not be for everyone, doesn't mean it shouldn't exist on the market.