I mean, you can say this about literally every edition. 2E, 3E, 4E, 5E, all of them had significantly less than 100% of players asking for a new edition. Especially if you looked at the people actually playing them. 3E was probably the most-demanded, because 2E was really looking incredibly old-hat by the end of the '90s. 5E was interesting because a lot of people were pretty dismissive about the idea until it was fairly close to release ("I've got Pathfinder, why would I want a WotC effort?" and so on).
To be honest, I'd like to see a new edition that goes a little further than WotC has been suggesting this one will, like fixes more things (particularly mechanically), and actually innovates a bit (particularly in the exploration pillar, which 5E has very poor support for).
Re: backwards compatibility, I think it's smart to do that, but it also means, imho, the next edition will likely have a shorter lifespan, and likely will be follow by a more significant edition change.