In my opinion: if you can't come up with an original name, that's your problem. Not trying to be blunt about it, but that's how it is.
My name before this used to be edjr and it's that for almost everything I use, gaming wise.
If users are unhappy with their current name, they can purchase a name change for 100k (but must be at least four, alphanumeric, characters long).
I don't see a point in deleting accounts just to clear up room.