During the 90s and early 2000s, it seemed like what drove the industry was box office names. You needed a big star to sell your movie, but it could be damn near anything.
So, Harrison Ford sells movies? Sweet! We'll make What Lies Beneath and K-19: The Widowmaker. Except those weren't all that great (well, I liked What Lies Beneath because it was a change of pace for Ford).
I think around the rise of the comic book movies and with the success of Pirates of the Caribbean, and LOTR and the Harry Potter films, they figured out that branded properties are more reliable than "Tom Hanks in..." From there, it's a hop, skip, and jump into remake territory. Particularly when you already own the rights to teh underlying property, thereby removing the licensing obstacle, I'd figure.