I think it's mainly because this year has been unusually good with original movies worth watching.
And the next expected major films this year that will pull in audiences are Dune 3 and Avengers: Doomsday.
It's looking like franchises are what are reliably bringing people in. They just want quality stories and not a deluge of committee-designed experiences. The new Spider-Man film was good because it gets Spider-Man and what audiences like about the character.