To me, monks have always been one of those things that just... doesn't belong. Like psionics, the main problem with the idea is it clashes thematically with what the rest of the system is doing. It feels like it was thrown in as an afterthought rather than considered from inception as a core part of the world and narratives the game is trying to build.
If I had to choose to get rid of 3.5 core classes, Monk would be the first on my list. Followed by the druid, cause druids suck.