I propose that it should be possible for closed questions to be opened/unclosed if there us sufficient interest (up-votes or favorite). This would mean that the masses could decide that although Jeff ;) thinks the question should be closed because it's of topic, if enough people (I have no idea how many) think they like the question or want to see answers to it, they could vote for it to be opened.
This is part of the design already. FAQ:
15 Vote up 15 Flag offensive 50 Leave comments 100 Vote down (costs 1 rep), edit community wiki posts 200 Reduced advertising 250 Vote to close or open your questions, create new tags 500 Retag questions 2000 Edit other people's posts 3000 Vote to close any questions 10000 Delete closed questions, access to moderation tools
Assuming you want to vote to (re)open your own question, being at 848 (nice) can already do this.
OTOH on meta, I cannot vote to close your question with 138 rep (until I reach 3000 rep).