I have something new to add. In TNG's last season, they made a HUGE, HUUUUUGE, HUUUUUUUUUGE dramatic mistake. In one episode, they made it known that warp travel damaged subspace where it covered. Which is wonderful to parallel global warming through car pollution, but moronic because A) Its the future. Warp drive is not fossil fuel powered. This is supposed to be the period where we've gotten beyond that. B) Warp drive is what drives Star Trek. It's how you get from place to place. This is like saying its dangerous to move/walk from one place to another because your footsteps destroy the environment and your travel at all destroys the environment.
So after this episode, and for the remainder of TNG, Starfleet slapped a warp 5 cap on travel, and going any faster required asking Starfleet for permission.
So TNG will need to deal with that. Star Trek dealt with it in the OTL by saying they'd figured out how to make sure engines didn't pollute, so it was swept under the rug as an issue. So by Voyager, they didn't need to worry about it. TNG would need to also address that. If it's not gotten rid of, it is a gigantic drag.