Err, I just meant, instead of taking your time to delete that stuff, leave it there so it might be of some use to someone. No other implications ...
ofc, one can do whatever he/she wants with his/her stuff.
Besides, I wasn't talking about the people who don't realize that an addon hasn't been updated forever. No offense meant, but those people most likely wouldn't be able to benefit from it still being there, for real. Aka, deleting stuff wouldn't effect them, one way or the other. I was rather referring to other addon authors.