Well, yes, that's what they already did. To varying degrees of acceptance. And because of that it's doubtful that the rest of the designs will be altered to suit an ambiguous idea of what these ships 'should' look like in 2019. I don't imagine that if we see flashbacks on STP to the Enterprises D and E, that they won't look any different than what Probert and Eaves originally designed.
Just like when Lucas went back and made changes to the original Trilogy: sometimes it's unnecessary and even unwanted to update old things when they were fine just the way they were.