I like to imagine that Chris will do something extremely crazy to get the rest of the world to notice him in a video that goes viral (on a scale of Harambe or Susan Boyle) when Barb dies, and get the kind of fame that will lead to him getting actual money from television appearances. Then, that will perhaps lead to some poor soul taking Chris into their home, if only so that they can blog about the experience or write a book or film a documentary to cash in on his increased fame.
Really, if you think about it, Chris hasn't done enough weird stuff to warrant much more than a cult following of people like us. Sure, you'll see Sonichu spread online, but you'll also see UkinoJoe stuff and David Firth stuff, and I wouldn't call those two 'famous' more 'noteworthy'. The most crazy thing he's done could be overshadowed by something someone did which is reported on a daily news show.
Maybe (and this is a BIG maybe) he'll do something like allow people to watch him do a live stream with a webcam. Telling people of the live stream about a week in advance to build anticipation by promising that he'll do something weird. Of course, he'll likely try to be coy and say "I've got a big surprise for all the Kiwi-Kinda people this saturday. Heh heh, you'd better not miss it."
The live stream will begin, Chris will introduce himself with a great big smile on his face that will immediately unsettle people. Afterwards, he'll reveal the partially decomposed body of his mother, and he'll tell the world that she died a week earlier. He will claim that he has a theory that Barb is like a Transformer, she can't die but her parts can break down and her parts need to be replaced once they do. He'll say that he didn't want to fix his father, and he didn't have the parts to fix Patti (I think that's the dog's name) but he's going to try to fix his beloved mother.
Then, he'll attempt to remove one of his arms with a knife. He'll start delicately at first, but he'll eventually start desperately hacking at the limb to try and remove it once he fully realizes how difficult it will be to remove his arm. The people watching the stream will cringe in horror, and some will probably call the police while others will be recording the stream to post on Youtube. Chris will eventually pass out from blood loss, or from the amount of pain he's in, and will likely be rescued by an emergency worker that someone called.
The next day, news sites all over the world will be talking about the event, and most people in the world will be hearing of Chris for the first time in an extremely clickbaity news article describing how the years of trolling and the death of his mother drove him over the edge. Kiwi Farms will experience an incredibly large surge of members, Chris will receive the type of fame he's always wanted, and everyone will have an interesting/horrifying story to tell.
Win win for everyone basically.