Not the majority of people, the majority of content. By watch hours mobile viewing is orders of magnitude more common than using a larger screen. This is even more so when talking about static photos which are now very rarely printed and seldom seen on anything larger than an iPad.
I don't necessarily agree that high MP isn't useful though, GoPro have shown again and again that spare pixels can be used to process for great effect. Their stabilisation is absolutely amazing technology and makes MILC cameras look very basic by comparison, and the work Google do with computational photography is mind blowing given the quality of the inputs. If the traditional camera companies put in this kind of effort we'd see huge advances.
Ah, maybe I misinterpreted what was said (as I often do).
Perhaps I should rephrase my question to ask: Is the majority of content being watched really being watched primarily on mobile devices? And is it the mobility or the size of the screen that is the salient point? Do 15 inch laptops count as mobile viewing? While I know it is pretty straightforward to approximate hours watched on mobile devices or internet connected devices, can the same be accurately done for larger, more traditional screens?
I don't think I disagree necessarily that a lot of people are satisfied consuming content on their 5 inch screens. It's just an unpalatable thought to me personally. I use my phone camera for documenting (literally taking pictures of non-digitized documents at work so I don't have to physically carry them home, weird signs or products I come across in stores but don't want to buy, etc), not capturing or memorializing. I don't think I've ever watched a video longer than 10 minutes on my phone, and generally I will wait till I am at an actual computer to watch it. I won't say never, but I don't see a phone camera supplanting an ILC for me any time in the near future. Two completely different tools that have a few overlapping functions. Mobile devices may be about convenience and quantity, but I seriously doubt they are capable of matching actual ILC or large screen quality for me.
That being said, I know my viewing habits are not representative.