Sounds like the user in question has more than just an obsession with Sesame Street. It sounds more like addiction. Anyone who says HBO removing the Sesame Street episodes being worse than the death of a parent comes out as addiction - a very unhealthy one at that.
I have to admit, I used to be addicted to the show (but on a much lesser level than the user in question), but I did stop watching for quite a while because my parent imposed restrictions on my watching of the show in February 1985, not to mention my interest was in decline already by that point (it may seem like Mr. Hooper's death may have been the peak of my interest). I was able to move on, join the rest of my class and move on to better things. Despite the restrictions and strong obsession, I handled it professionally, likely because I knew - several years in advance - that the end was coming, having realized the show's target age group. If not for the restrictions, I probably would have watched the show far less frequently by Season 20 when the "2 through 12 only" number sponsors would have been done away with in favor of "zero through 20", and by the 1990s many of the classic segments had new sound effects and some having new background music added, rendering the show unwatchable for me. And the show would only get worse after the turn of the century.
After I moved away and got a job (which stands to this day), I do watch the classic episodes and segments on the Internet - but only a couple of nights a week on average.
Regarding the new sound effects and new background music, I'd be quite interested to find out what "Jughead's J Story" sounds like with the new background music added - is that 1990s version on YouTube?