I don't think fan input had anything to do with it. The series was made for 4:3 aspect ratio, and they want to make as few changes as possible.
No offense, but the series wasn't made for a 4:3 aspect ratio but for 4:3 tube television sets (with overscan, I constantly need to add).
This is a subtle but crucial difference, IMHO, that too often gets forgotten (and Star Trek is about the art of entertainment and not the art of cinematography).
It's not just the difference between fan preferences; it's the difference between seeing all of the picture or not seeing all of the picture.
The way I see it it's the difference of watching an image with excessive overhead and bottom space (4:3) on a display device (16:9) it was never meant for.
How would the TNG directors shoot the series in widescreen assuming they theoretically could travel back in time?
Looking at the 21:9 widescreen footage of Generations I'd dare to say that for example the bridge scenes in TNG would be trimmed not only to fit a 16:9 widescreen but also to look much better.
But obviously that's something we should discuss in the future - once a tasteful 16:9 version of TNG is made available for evaluation and examination.
Bob