Considering that Kingz does know at least a few people who would quit WoW if Wc4 came out, it does prove that there are other people in the world who would do the same. It proves that at the very least there is a small population of people who play WoW who would quit it when Wc4 comes out. Sure, it's not much, but it's something at the very least
I don't have to quit WoW, though, as I hate it (not a big RPG fan, got into Fallout 3 and Oblivion, that was about it and I'm sick of them now

)
As for LAN not being available for future releases of Blizzard, programmers will just find a way around that to create private servers. After all, if they've done it for WoW, they will be able to do it for these future releases. The simple fact is,
no man can create a puzzle that another man cannot solve.
But people who use Garena and such aren't scum, that's a bit radical. I mean, come on, sure they're not paying Blizzard, but Blizzard is still reaping in massive amounts of money. Hell, WoW is the best scam they've ever done, making gamers play every month just to get up to level 70 and then walk around doing stuff. Brilliant! So don't say people who aren't paying Blizzard for their entertainment are scum. People who call them scum are scum, so by all means call those people scum, but don't call the afore mentioned scum.
That's just scummy.