I also don't understand all the people that think just because you pay a few players you can't keep adding. This is the exact propaganda that the Jones family wants everyone to eat up: that it is the players' fault, not theirs that they cannot construct a winner.
The Eagles and Lions both have QBs making $60mil and $53mil annually along with players all over their roster making top dollar, yet they still add.
It is because GMs that actually care to make it work, can find ways to keep adding talent by massaging the cap and also just accepting the cyclical nature of the league and being fine with a down year or two after a 3-4 year window of going all in.