Many teams would become a better version of themselves if they started doing everything like NE, even though they'd have to use their own QB and coach.
As an example, PIT was shelling out $30 million or more between Bell and Brown. Last year, NE for all their RB and WR combined spent under $20 million. For all the talk about the Killer B's and then adding Smith Schuster and the high flying offense in Pittsburgh, NE scores more points than PIT every year . . . and they spend a lot less money to do it.
Sure, having TB and BB plays a big role in that, but NE would rather have the best 53 man roster and not overspend for a handful of guys. I outlined in other threads that NE let 10 guys go or traded them away that ended up signing contracts worth over $550 million. I forget all the players, but they included Nate Solder, Chandler Jones, Dion Lewis, Jamie Collins, Malcolm Butler, Jimmy G., Brandin Cooks, etc. People thought they were crazy and the Pats would never overcome the loss of top talent. Since losing those guys, they went on to win just as much if not more WITHOUT them.
I get that not every team is going to have a QB married to a supermodel. It's been calculated that Brady has taken $80-90 million less than he could have gotten over the course of his career. That's basically an average of $5 million a year. While that's nice to have more money to spend on other players, an extra $5 million is not going to make or break a team.
NE has definitely tapped into the role player / situational football model. They get guys that cam play two downs, play as a third CB, catch passes out of the backfield, etc. for way less money. They can get 4 competent guys for the price of less than one and that gets them more depth in the process.
It doesn't matter who the coach or the QB is. Having sound fiscal decision-making and building a team with all good but not great players is a model they have mastered for almost 20 years now. Not enough teams look at the big picture that a LB that is good on 50% of situational snaps is worth more for $1.5 million than a guy that is great 90% of the time for $17 million. The secret is finding another LB that does well in the remaining 50% of situations also for $1.5 million.
I also understand that most franchises have coaches and GM's under the gun to win now or get fired, so many teams will not give their head coach or GM time to build a system and a salary cap model to experiment. But NE has laid out the foundation and framework on how to be successful. A lot of this stuff isn't rocket science.
Using the Steelers as a potential example again, once Bell departs, they would be in line for a high compensatory pick down the road. However, if they go out and sign another high priced free agent, that would cancel out any pick they would have earned from Bell leaving. In NE's case, they will be getting 3rd round compensatory picks for losing Butler and Solder. They replaced those to with a cast off from Cleveland (Jason McCourty), another UDFA (JC Jackson), and traded a mid round pick to acquire another tackle ( Trent Brown) in addition to taking an OL in the draft (who got hurt and went on IR).
So to review, NE lost Butler and Solder but restocked by finding two playable CB, adding two cheap OT's, AND getting awarded two 3rd round compensatory picks to go along with all the cap savings they had to play with by not breaking the bank to bring back Butler or Solder . . . both of whom went on to have marginal seasons with the Titans and Giants. THAT'S how you build a winning football team . . . and that had nothing to do with Tom Brady.