Would CGI have ruined classic movies?

[wonderer99]

For absolutely no reason whatsoever the thought popped into my head "What if CGI effects had existed in the 70's and 80's" and it got me thinking about all the great physical props, miniatures and great creatures we have had over the years and how the movie would have been affected had they been created in a computer as they probably would now.

The ending to CEOTTK
Jaws
Alien
E.T (remember the outcry over the CG ET?)
Back to the future
The Terminator

Now all these movies have various special effects but it would be interesting to know how much the movie would differ without the classic effects. CGI gets given a hard time these days with most preferring physical effects. But these methods were used only because there was no alternative. We romanticise the old techniques today but they were achieved mostly due to lack of alternative methods. Spielberg has used a ton of CG in his recent movies that would have been practical effects in the 80's (the jungle chase in KOTCS) but does the movie suffer for it and I wonder how effective the shark would be in Jaws had he had the power to do it digitally in the 70's? Probably the best example would be Lucas with his prequels. How would they have been received if it had all been practical sets and miniatures?

I know this is all hearsay and what ifs but I just thought it curious as to what degree CG affects our enjoyment.