I would love to see classic musicals remade.
The problem is casting. In previous eras, actors were much more likely to be highly proficient in singing and dancing than they are now. Standards were so high that even those with good voices were frequently dubbed. Audrey Hepburn had a very pretty voice but still had to be dubbed. As did Christopher Plummer in The Sound of Music and Peggy Wood - even though she had formerly been a Broadway singer. It was recognised when a voice wasn't up to it.
Today, there would be pressure to cast A-listers who don't have the equivalent skill levels (think Phantom, Moulin Rouge, La La Land - hardly any of the leads in those had professional level voices).
You could easily find the talent - just look at Glee - but most of it would likely be "unknown" and thus considered a casting risk for a multi-million dollar production. And these days, I'm not sure that audiences - or even actors - would necessarily accept dubbing.