I think one of 4e’s problem is that the DM tools are now so structured, it becomes a hindrance for people with creativity issues to push through the proposed models and discover “new tech”. I know I’ve been having a hard time selling some of my weirder ideas like “Trap-Monster hybrids” and “The whole party stuck in the same body” because it seems people can’t see it done (or can’t afford the effort to squeeze the concept) in their 4e games.