Perhaps but there has always been the Big 5 major studios. Right now there is Universal Pictures, Paramount Pictures, Warner Bros., Walt Disney Studios, and Sony Pictures. Used to Sony wouldn’t be counted or they would say big 6 but there has normally been 5 major studios. One dies another takes it’s place.
RKO and MGM used to be part of the big 5 back in the day now gone but replaced. I think the same will happen here. Someone will fill the gap. Apple is spending big money for Scorsese and Ridley Scott. Amazon and Netflix are also trying to be players. I don’t think Disney made the dent in competition that they thought they were going to make.