Now I know that 1440p is being used by current-gen 70/80 users quite frequently, but when will it be the resolution that your average gamer is using like 1080p?
When you donate +70% faster GPU's to 80% of the market for free?
In all seriousness over a certain "good enough" baseline, many budgets gamers really don't care much about the great resolution rat-race. MOAR fps ESports, more battery life / lower fan noise for laptop owners, better older game compatibility (non-scaling UI's vs HiDPI displays), etc. There are lots of reasons besides performance / cost alone as to why someone would continue to want 1080p. As for polls, as others have said the sampling bias inherent to enthusiasts sites will skew the answers you get so that 100 people here will give "higher end" answers vs 100 answers from actually average people.
Edit: To give a real-world example of UI scaling :
1080p vs
1440p vs
4k (download and view them all full-screen). See the obvious problem with just piling on the pixels vs fixed scale UI's (elements such as buttons, maps, quickbar, etc, shrink to the point of becoming unplayable). As someone who often plays more older games than newer ones, 1080p is definitely the sweet spot or more specifically 92-96ppi has been the "hard-coded target" by developers for a very long time. 1080p -> 1440p upscaling is still regularly uglier than 1080p -> 1080p native especially for things like small text. 27" 1440p gives too small UI's in many older games. 32" 1440p can mimic a 24" 1080p (or 29" 1080UW) by running 1080p centered and unscaled with matching ppi, but that in turn just requires more "fiddling" around. Even 1080p -> 4k upscaling in theory is pixel perfect, but in practise often looks different, not to mention it's an "effective" 28-32" 1080p which is 69-79ppi or worse than 27" 1080p's 82ppi (some things look "too big", aliasing artifacts between the 2x2 upscaled pixel blocks are unpleasantly large, etc). And running 1080p centered and unscaled on a 28-32" 4k monitor is like downgrading to a 14-16" screen. Whereas 24-27" 1080p native is a low-cost no-brainer for universal game compatibility.