I have full faith in the power of imagination, and even though you have a world that is so heavily explored as Star Trek, there are places you can go with it that Berman never could have conceived. While it's true the public were growing tired of Trek, they were ultimately tired of the sameness of Trek through all those shows. The one thing I think typifies the TNG-era shows is they are dramatically flat. There are no true peaks and valleys. Even the music is flat. Compare that to TOS which is positively melodramatic. And that's why the predominant experience while watching a TNG era show is one of, at best, mild amusement, but not the engrossing feeling of watching, let's say, City on the Edge of Forever, or Balance of Terror. That's why people remember TNG episodes like Inner Light, because in a few of them, they really hit a deep emotional chord that is largely absent while the crew sits around debating the most political correct way to proceed. The high drama is the one aspect of TOS that was never truly recaptured, and it has nothing to do with the basic rules of the TNG universe. It's how you write the show and the style of how you present it.