Bitcointalk has no authority to license anyone for anything, and I'm sure if the government found out about anything like that happening, they'd take a very keen interest in it.
Theymos can run the forum how he wants to, though, and I think that should include some consequences for being a shitty campaign manager. The managers of bitcoin-paying campaigns are pretty good, but those bounty managers totally suck. They'll take anyone and I think some of them have even been caught abusing their own bounties with alt accounts. A lot of them are a bunch of greedy, unethical cretins who are also irresponsible and couldn't care less if the forum gets wrecked because of all the spam. Theymos
could do something about them, but he's into letting people basically do what they want.
He did make the merit system, which was huge, but I do think he needs to crack down on the managers--but it's not going to be in the form of licensing.
I don't think he meant a license as the literal sense.
Well, I'm just going by his words. In the real world, the word "license" means a very specific thing.