I agree, but perhaps the reason it is out of ideas is because mainstream movies have to follow such a restrictive format. If you have to have a limited array of characters, 1.5-2 hours time, and have to end happily then what the hell can you write about? Just occurred to me...
And PG-13, thus forcing a strange set of values on us, where nudity leads to immediate moral corruption and it's OK to show violence, as long as you don't show its results.