I get that it is awesome to have more resolution, but what people do with the images? Do they print huge? Do they admire their images primarily on their monitor and zoomed in substantially?
I think very few photographers actually need 50 MP. Some people simply want the most because they equate the most with the best. Even billboards can be printed at high quality with 20 MP or less.

Having more MP does make sense in a couple of cases. For those who are reach limited, more MP allows a deeper crop. Often, the reason for the reach limitation is budget – few can afford the great white lenses. I feel that Canon has tried to address that with lenses like the 800/11 and 600/11, both of which take extenders. At the other end of the distance scale, macro photographers looking to put more pixels on target can benefit.

Those cases aside, I think most people who want more pixels don’t actually need them, if they’re honest with themselves.