wonder what the reaction wouldve been had they used the Ent D for the Ent A...
Probably something along the lines of "What the hell is this?" since
Star Trek IV came out in 1986, and TNG came out in 1987.
I think what he meant to say was "What if there was a new model for the Enterprise-A at the end of STIV, and then it was used as the new ship for TNG the next year" (i.e. TNG would be about the crew of the Ent-A, although the filming model itself would have been the same as the D.) At least I think that's what he meant; I could be completely wrong. But with that scenario, basically that would have meant that TNG would have taken place right after STIV, and not in the 24th century 75 years later. The TOS cast could have been gradually replaced by the new cast, and the use of the movie ship models would have been more contemporary. Or they could have set the show five or so years later, with the TOS crew already gone by that point, so the Ent-A would have already had some spacetime logged, have uniform and prop changes made, etc. Also, I don't think that if this scenario actually happened, that the ship would look anything like the D, as it would not have been designed by Andrew Probert but more likely by someone like Bill George.