Any remastering/remaking of visual effects will be done in CG. It makes no sense to go back and retrieve energy beams etc which are essentially a fuzzy line when they can be made just as easily natively within the package used to create new effects. And I never said replacing an Excelsior every time with something new, I said about replacing ships where applicable with other TNG era designs which already exist. Hell, what about replacing Excelsior's with Excelsior class refits? That would actually make more canonical sense.