Even if the complaint is "i am taking my money and going home" that it is important and i doubt it will be overlooked this time around. From WOTC's pov what matters is the volume. If half the 4E players say they hate wizards now and wont buy their products that is a serious PR problem.
No... that's still completely useless. WotC IS MAKING 5E. It is happening. Even if half the people here on ENWorld said it was a bad idea... it wouldn't matter. You know why? Because we are the RPG's '1%'. We're the hardest of the hardcore and not actually indicative of the gaming public at large. So half of us saying 'don't make it' (especially if we gave no concrete reasons why they shouldn't make it) would not actually stop them from doing it.
And this is especially true considering that we're still a year and a half out at least, and what we say now is complete and utter crap. On both sides, positive and negative. We have 18 months to change our minds because it costs us nothing to do so. So WotC CAN'T take our claims at face value and instead have to look BENEATH THE SURFACE of our exclamations or complaints. And unless you actually talk about what you are and are not interested in... you don't have anything under the surface for them to get information from.