The Eagles won the Super Bowl, because the moves they made
turned out to be the right ones. Also, Carson Wentz (a top 10 QB) is still on his rookie deal, and the Eagles were able to field a balanced quality team, with experienced depth (Nick Foles); plus their draft picks (Derek Barnett) were heavy contributors.
The Eagles winning the Super Bowl was the Perfect Storm. Eventually, it is imperative to pay top dollar for the QB, because there is no guarantee that you can replicate what he brings to the table.
@Pokerbrat2000 Would you spend a nice chunk of the cap on Aaron Rodgers?