One highly off-topic question of real analysis was asked in the main site by a new user. One user sent, 1 hour later, a long answer going far beyond the the question, and then, 12 hours later, edited the question to make it more interesting and in keeping with his own answer. [The question has been closed little after the answer was posted, and, after the question was edited, it was reopened, the 5 votes including the answerer's vote, soon after being edited, and including a moderator vote.]
Should such edits be recommended?
I don't have a definite opinion. In the negative side, the final interesting question remains attributed to a user who has little to do with it [edit: this is much less the case once the question is cw], and who also didn't indicate any agreement to such changes (as a frequent editor I usually try not to modify the intention of a question, even if it's just a broadening, unless this was suggested by the OP in the comments). Also, I see a problem with modifying a question so as to make it in keeping with one's own answer. At the positive side, this results in producing a post of interesest to the MO audience rather than a post which was to be eventually deleted.
Side question: in such a case where the "community" has decided to take over a question, should the question be made cw?
Edit: the question has now been made cw by moderators.