At the same time, I dont feel like I've ever watched a movie and thought it needed to be modernized. It doesnt bother me when something is remade, it just never occurs to me.
Part of the fun, part of the charm of watching old movies for me is being able to immerse myself in a historical time period. And perhaps unlike the people whom some in Hollywood think comprise their audience, I don't mind black-and-white, noisy audio, or subtitles. So my default reaction to any remake is to assume it's gratuitous or mercenary. That said, I could probably list dozens that I liked and thought offered something worthwhile.
But yeah, I almost never think: Gosh, I wish this were in color and starred Tom Cruise!