Not only would I be much happier with new battle footage for the last episode, I'd be happy if all the CGI fleet scenes from seasons 6 and 7 were redone, with all new ship designs instead of the tons of old Excelsiors and Mirandas, and those FC ships.
I don't have a problem with that, because it implicitly suggests that the situation was so serious for Starfleet that it was dragging out all the old ships that might otherwise have been mothballed or scuttled back into active service.
And really, it's always been mildly unrealistic that Starfleet has so many different designs anyway. Yes, they supposedly all have different specialties and new technology, but no other culture has ever been seen to have such a wide variety of designs. Some like the Excelsior
classes were specifcally planned as testbeds, but others feel like "I'm bored, let's design a new ship for the lark of it."