How many Star Wars, Avengers and present MCU films we had in 2009?
Frozen did $1.25Bn in 2013, and realistically the sequel is supposed to do that much today despite a growth expected in domestic.
That leaves us with Toy Story 4, Aladdin and The Lion King. Again, TS3 did almost same as TS4 in dollars despite TS4 ahead in admissions in majority countries by even good margin.
Aladdin, well Alice did similar numbers just few months later.
All I am left with is TLK. Now, TLK is a film doing $575-600mn domestically, a number that would be $450mn Approx in 2009, a number that would have placed it to do $1.3-1.4Bn worldwide even in 2009 using slightly worse Alice ratio.
So that's what have changed. Rise of MCU and Disney, rest of boxoffice is shittier than it used to be. And no. Boxoffice isn't zero sum industry, every year there would have been a 600mn grosser, not from Disney.