Minimum Word count may be a good idea; but ultimately if you're going to post a worthless post, it will be longer than whatever Minimum Word count we have on here, and even if it isn't, it will say this doesn't have enough letters, and whoever is doing it will add some more.
I think we should just, as regular users, start using the Reputation System as Root said. Using it doesn't discount Posts, so people who like posts won't be disappointed; but in the future, if we ever want not to use Posts at all, we'll be in the position to do so. If regular users start doing it, it should not be too long until less regular users do, and then everybody, and then people will come here, see different reputation levels about, and hopefully see a Sticky or something on Reputation, and think ah I should do that.
Not that I'm against using Posts
Haha, I am rather fond of the post count system; but I quite like the Reputation System too