I think he’d be please that there were movies, but unhappy with the actual movies themselves (What author could be happy when a long carefully crafted book is stripped of most of its richness to fit into a 90 minute flick?)
There are some movie adaptations that are excellent. Case in point is "Shawshank Redemption" which was taken from an obscure Steve King short story.
90 minutes? Each of these films is close to 3 hours long.