I would say no, personally. For one thing, not all of them are opinion polls (though I can certainly see how some of them, including this one come close). For another, I think the site would be better off getting rid of "community wiki's" instead of encouraging more of them. Personally, if my name is attached to an answer or question, I do not want any random person being able to make edits to it. The moderators and high reputation people are slightly different and I do not mind their edits for two reasons: 1. They have that ability because they have earned the trust of this community. 2. By tradition since this site started they confine themselves to formatting and minor grammar/spelling tweaks. Neither of these will necessarily hold for community wikis.
Other sites have avoided this mix-up of meta and subject-matter threads by having a separate meta site. I think we discussed this a few weeks ago and decided not to branch off like that. There has been an increase in meta recently, probably due to the switch-over from SE to OSQA, but I'm hoping that over time it will calm down.