I think the reason why chris isn't making more Sonichu pages is a combination of things.
You remember what were the last official pages of Sonichu he uploaded were? it was the My Little Pony crap, the Sonichu remake pages that he did were only supposed to be previews by his words.
But it's obvious that even chris got bored of pony stuff, since he only made like, 5 pages and then gave up and started drawing Sonichu again. He even drew more ponychu pages and didn't bother to color them in.
Then either laziness took over, or idea guy started forcing these ideas on him by pretending to be his characters.
All of a sudden chris finds out Rosechu has a dick, and he loathes this storyline.
But he can't change it because in his mind it's real history! He even did a poll on twitter and everybody voted to keep Rosechu a tranny.
So now if he wants to continue drawing Sonichu he needs to implement this trans Rosechu storyline, and more crap about armies and concentration camps and magi-chan having an affair with mew-two...
And he obviously doesn't want to do it, and even if he doesn't draw more Sonichu he still gets $655 a month from patreon...
So he's probably like "fuck it, I don't care anymore, mental blocks... stress and hippopotamuses on my mind..."
...or at least that's my best guess.