Quite frankly, I find that Trek fans' hoop-jumping leaps of logic in order to justify what is essentially 80's and 90's budgetary limitations is nothing short of amazing. That's why I keep saying that if there ever is going to be a TNG-R, that there'd be absolutely no reason why those old movie models couldn't be replaced by new CGI models of newer and different classes. Like I said in another thread, it's not like the scriptwriters for such episodes as "The Naked Now" and "The Pegasus" actually envisioned the ships to be the same class as the Grissom from 80 years before. The VFX people were working with what they had available at the time and with their budget, whether whatever model they ended up filming made logical sense or not.
Right. I'm okay with the Excelsiors, I guess, but there are some cases where I'd appreciate a substitution. I've already pointed out that the Lantree in "Unnatural Selection" was clearly scripted to be something much smaller than a Miranda. And I'd definitely like to see the "large Klingon Birds of Prey" replaced with something more like a K'tinga, though that might require redoing a lot of DS9/VGR effects as well as TNG.