This seems plausible, except Yuki seems to have her powers even after Kyon wakes up from his coma, so...>>9969540
Rather than going deep into speculations, I'll just say the first thing Kyon says that has nothing to do with anything is he once believed in the supernatural, but abandoned those thoughts, hence why no supernaturals exist if he were God. Meeting Haruhi excited those childish thoughts and he subconsciously re-will them into existance. I can guess it sprouts off from there.
I'm still on the fence on everything in this damn series.