Even if Hussie wasn't joking, it's sort of implied that Fruit Gushers are made from troll larvae. Probably the Fan Trolls before they had a chance to grow up. Given that, should we come across any Sue-Fan Trolls, we are free to murder them (and preferably turn them into Fruit Gushers) since they're breaking canon by still being alive. Also, Alternia blew up and Beforus was wipe out by the scratch, so all the Fan Trolls should have died anyway.

We can still kill the Sues which pretend to be the canon characters, yes? No need to be disappointed XD

Andrew Hussie rarely takes fan questions seriously, and it was a clearly sarcastic and joking answer. Of course all fantrolls aren't really canon (and even if they were, they should all be dead: cf the destruction of the universe and everything...)

There are still godawful Homestuck Sues out there. I don't see it as any kind of quarantining. But as a way of forcing PPC-ers to be clever and creative and run into probably hilarious problems?

I'm gearing up to write a Homestuck mission (eventually); we're not actually declaring Homestuck quarantine, are we?

If they're all canon and they all seduce Homestuck characters, could it conceivably end like the Sparklypoo House debacle?