Are you suggesting that like Hello Dolly, users remove any theme that comes with WordPress out of the box that is not being used? I hope we don't get to the point where WordPress comes with 10 themes and users have to spend time deleting all the unnecessary crud. Reminds me, should probably figure out what the plan is for TwentyEleven, TwentyTwelve, and TwentyThirteen. When will they stop being part of WordPress and live in the Theme Repository as seperate entities.