IMO, disco will end up a fad that dies off pretty soon. Bear in mind, it's already been around 4-5yr already, with the first disco record AIUI being Andy Kim's "Rock Me Gently" (tho I wouldn't count that disco, myself).
A couple of good things would come out of it: "Xanadu" isn't made, & Olivia never cuts "Physical".
Travolta's career is probably pretty sunk. He might, just, get "Urban Cowboy" anyhow.
This also means
Valerie Landsburg never makes
"TGIF".
That means she might not get cast for "Fame" in '83.
(I loved Doris, & Valerie's got a lovely voice.) It also means Donna Summer never gets a Grammy for the theme.
Swayze, who started on stage, IMO would still get his "M*A*S*H" role, & could still go from that to "The Outsiders". I wonder, tho, if this butterflies his career enough he misses "Dirty Dancing".
Or at least keeps him out of some of the dogs he made in between that, "Road House" (which wasn't unbearably awful
), & "Point Break". (Can he get an action star role in there somewhere? Some low-budget actioner nobody expects to go anywhere, where he can fight, & end up in a hit film?)