alright, I voted "yes" because it can't hurt (to have VAC, not to vote "yes"), but even if it happens, don't expect VAC to be some sort of mix of robocop and charles bronson...
it's far from being perfect. just yesterday, a buddy of mine encountered two obvious cheaters in cs:go, the guys weren't even hiding it, saying it in the chat, telling the world how they have multiple accounts anyway. clearly not the brightest of the bunch, so they probably were using free cheats and weren't banned at once.
valve have always said the way it works is you get banned a couple of months after so you can't know what triggered it (that would be the cheats, duh ?) and so the legend says every two or three months, a lot of accounts get banned and the evil cheaters cry in a dark corner because they have to throw 14€ valve's way to get back in without anybody knowing.
that's all fine and dandy, but how could that work with ql ? usually the nihilists like daddy don't care about making new accounts every other day, every other months would be a massive break for them. registering on steam isn't THAT much of a hindrance either. so id still would have to chase the bad guys around and with some luck, a few sneaky togglers MIGHT get caught IF they're using retarded free cheats. granted, those are the hardest to catch and it would alleviate some doubts in leagues (or the more serious public CA) but there are no certainties here
there's no magic formula, there'll always be cheaters, you can only reduce their number and make it difficult for them. that would still require a dedicated member in the staff updating his system when a new cheat is out (meaning money and an anti-cheat being somewhat a priority), for now we're stuck with the amateurish cg_wh 1 and I don't see VAC being much of a messiah
Edited by generic nickname at 08:27 CDT, 22 September 2014
They could forced-allow only those who own games that they were BUYING on their Steam account to play quakelive, so when they are caught cheating the removing of their Steam account would permanently make them lose games they paid for.