It seems to me like if Sonichu 10 wasn't the end, then all you'd really need is some kind of "And The Adventure Continues..." ending. It seems most like what Chris would do, and I don't mean just out of sloth. Metal Sonichu is still out there, but for now there's peace, the homos are cured, the trolls are all dead or imprisoned (but mostly dead, messy, gory dead), and even though as Colossal Chan he's basically GodBearJesus now, he's still the kind of guy who doesn't want something to "end" so much as to at least say "so there." He had to beat Mary eventually, so he did, so there. He had to beat the trolls eventually, so he destroyed their HQ with everyone still in it, so there. Now they're having their tepid Christmas issue and they're getting on with their oh-so-interesting daily lives, so there.
Really, all you need is to go "But while their adventures aren't over, this story is, so there."