I joked once about how the well of ideas in Hollywood ran damn near dry, but this pretty much proves it...
Hollywood has been remaking movies as long as they've been making them. Dozens of original movies still get made every year. Some of them are even good.
Also, remaking a movie doesn't eradicate the original from existence nor does it destroy its goodness.
I have great fondness for The Secret of Nimh
(which, by the way, is from a book) but frankly, it's kinda boring.