In a recent interview with The Hollywood Reporter, Disney Studios chief Alan Horn and Sony Pictures chief Tom Rothman talked about the dispute between the two companies over the rights to Spider-Man as well as their eventual new agreement. When asked what was the most important thing that pushed them to resolve their standoff, Alan Horn had this to say:

Tom Rothman was pretty much on the same page as Horn, saying that while Sony has made good Spidey films without the help of Marvel Studios (i.e. Spider-Man: Into the Spider-Verse), the new deal was pretty much a win for all parties involved.

Spider Man  Sony and Disney Studio Execs Say the Fan Base Pushed Them to Sign a New Deal - 85