I was actually wondering if there might be a US version of Not the Nine O'Clock News, I'd forgotten there was actually one in OTL!
It's hard to imagine that show without Reagan -- but then again, it's hard to imagine anything from the 1980s without Reagan (as has been pointed out previously in this thread).
I suppose that Diff'rent Strokes could survive relatively unscathed -- except, of course, for that Very Special Episode, but I think the show's "fish-out-of-water" premise would seem... dated by TTL's 1978.
But I'm getting ahead of myself; we're in 1976, not 1978. I think Brainbin's butterflied away The Six Million Dollar Man. Sadly, that probably also butterflies away The Fall Guy, which I remember fondly from my childhood.....