unfortunitly the majority are never happy with any number of MP, yesterday they wanted 40, today they want 80, tomorrow they will be up in arms if its not alteast 100. There are many disadvanteages to cramming more and more photsites in the SAME AREA (35mm). Most dont care. More MP means faster shutter needed to freeze images, more noise, gigantic files, etc.
I personally am fine with 30mp, just want faster FPS, I am printing 40x30 300dpi prints that you can stick your nose against and see enormous detail. Like you mentioned, how big do these people want to print. An honeslty I bet you majority of them dont even print!!!
Most wont be able to tell you that 20MP can be printed at 40inches with extraordinary detail from a full frame sensor. I have seen huge prints from the 1dxii.
Sadly you have a generation that wants always more "k" video and always more megapixels stills. Who cares about 8k? 99% of the content on youtube is 1080p, why? cause working with 4k is a disaster of a process and space, workflow.
There is a generation that hasn't even mastered the camera they have and they think they need more to do what they dont need.