Just remember to not get too ahead of yourselves. Sorry to tell you guys but Valve has already said that they don't wanna work with 6's due to the inflexibility of the metagame. So if it's anything, it'll be highlander. Remember that in CS, everyone hates the autosniper, yet it still gets used in competitive because valve sponsors the tournaments. If history repeats itself, we might have baby face's blaster scouts and tide turner demomen. It won't be as good as pugs, and probably not as good as lobbies. What it provides is some exposure, which we desperately need. People like Muselk will make videos of competetive matchmaking, more people will put playcomp.tf in their names, etc.
Basically don't get TOO happy, but get psyched.
Edit:: ignore the first 3 sentances