The popularity of 5e shows that it's the case. If a majority was discontent with the game, it would not going on that strongly.
It's really interesting to see how extremely minor and, more importantly totally optional changes are seen as a victory by the above minority. However, not only are the changes extremely limited, but the core books are totally unchanged, no reprint changes, whether in technicalities nor in "political correctness" (the orc perspective is unchanged from 7 years ago), and power creep is totally under control, while still keeping at bay the most critical adversaries of the game with some announcements barely followed by any real change. For me, this is a mastery of the game and its environment that I can only applaud, both from a management and a player perspective. Esepcially, if I may say so, a long term player perspective who not only loves the game, but does not particularly want to throw all his investment in the bin like what was done in half the time by 3e, then 3.5,then 4e. YMMV and YCMV but still...
And my take is that this will not happen for a long, a very long time, because that would indeed cause the sales figures of 5e to crash as people would stop buying anything to wait for 6e anyway, whatever the contents of the new edition. Moreover, one of the reasons for the success of 5e was the extensive open playtesting that gave the edition that we have today. After the crash of 4e, it was an easy decision to make to do things this way, they had almost nothing to lose, but not only is it a very costly undertaking, but it's not the case today, and considering the immense success of 5e, there is a high likelihood that any such sort of polling would probably result in the same kind of game that 5e is, an extremely flexible game that allows so many different playstyles and really facilitates the induction of new players, whereas most of what the minority wants is a return to the extremely crunchy and geeky games of previous editions which have, on the contrary, proven that they do not last long (so ROI is poor) and that their audience is extremely limited.