I think the Roger Rabbit multiverse stuff was mostly escapist manchild fantasy pre-Idea Guys, and Chris deep down had accepted it as fictitious wishful thinking, the incident in Mary Lee Walsh's office aside.
The only precedents for his delusions pre-Idea Guys that I can think of were when he pretended to talk to Sonichu in Mary Lee Walsh's office and some statements he made in one of the emails he sent to the trolls back in the Classic Chris era.
Hell, even him "talking" to Sonichu in Walsh's office was probably just dumb performative bullshit like you'd see from a kid in grade school. That incident happened in the early 2000's. Relatively speaking, Chris was a lot more stable mentally and emotionally back then. The trolling and complete isolation that helped strain Chris's mind had yet to begin.
Both of those were a lot more sedate compared to his behavior and statements now and were a lot more isolated as well. So it very easily could've just been Chris goofing around instead of a genuine belief in anything.
I don't know what happened to Chris when the Idea Guys and the Teen Troon Squad got involved, but something in him obviously changed.
I'd wager that Barb's abuse during the quiet period between the Snyder incident in 2011 and the fire in 2014 was the start of his descent, which was slowly exacerbated with Barb's deteriorating health over the past three years. the Blarms incident, the whole fiasco involving Doopie, Cole being a hipster dickwad, whatever the hell was up with Jessica Quinn, and seemingly benign or positive events like BronyCon, the return of Sonichu, and monetizing his online infamy.
It's like everything of note that happened with Chris between Bob's death/Snyder's injury and the Idea Guys entering the picture slowly chipped away at his already dismal mental well-being and whatever the Idea Guys did to Chris ended up being the straw that broke the camel's back.
Sonichu had been dead in the water for years and the idyllic nostalgia he had for Manchester High School was gone for good once he realized what was really going on with the Gal-Pals at the time. Then the fire happened, Chris had nothing left in his life.
Then he trooned out and his life started to marginally improve. He made a few acquaintances in the local LGBT scene and had some fun at The End Games and got out of the house more often, even going to conventions without any real incidents.
Sonichu came back after a very long hiatus and Chris found a way to make money off of his online infamy. He got more into MLP than ever before and had a great time at BronyCon.
But at the same time, his life got worse as Barb continued to financially abuse him while her health began to deteriorate more noticeably than ever before. He wanted an escape. The Dimensional Merge, the CPU Goddess stuff, and the revival of Sonichu ended up replacing Manchester High School as the go-to "happy place" in his mind.
Chris is no longer longing for an idealized past that never truly was. Instead he's now looking towards a future that will never happen. The Idea Guys capitalized on this and really messed with his head and ultimately broke him.
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