I might be inclined to agree with you in some way if you were right at all.
Your argument carries over into every possible aspect of a film's production.
Should we colorize the original King Kong because the technology is now there to do so. Don't you think if we revived Merian C. Cooper today he would want his film presented in color? It wasn't available to him back then, but surely that would have been his intention. Why not covert Gone with the Wind to 3D? Clearly David O. Selznick and Victor Fleming would want their film to be as cutting edge and epic as possible. This is the kind of thinking that taken away the original Star Wars films as fans have loved them probably forever and has given us a French Connection Blu-ray that is damn near unwatchable.
I said it before and I'll say it again (in fact I'm going to
quote it because I'm tired of writing it)...
Blu-ray isn't a barometer for how good a movie should look, but a tool to allow it to do so to the best of its photography and stylistic ability.
The beginning, the middle, and THE END...
So when people say, "Predator isn't a very good Blu-ray because it's so grainy," what they're really saying is... "Predator is a great Blu-ray of a very grainy movie but I don't know enough to tell the difference."