The Eagles have locked up their franchise quarterback for the foreseeable future after signing Carson Wentz to a four-year extension. If Wentz is able to return to his MVP-like form from 2017, his new contract (which features the most guaranteed money in NFL history) will look like a steal to all fans.
Getting a deal done this early was extremely beneficial for the Eagles, because now the team doesn't have to wait until the end of the season and potentially have Wentz coming off a career year wanting the highest football contract in history. This deal also benefits the Eagles because it will harm their biggest rival in the division, the Dallas Cowboys.
The Cowboys drafted Dak Prescott in the same draft as Carson Wentz, meaning he is coming up on the last-year of his deal this season. With quarterbacks like Russell Wilson, Ben Roethlisberger and now Wentz getting big money deals this offseason, Prescott's agent will look at those contracts as starting points in his negotiations, and will likely want to command more money than those contracts for his client. If Prescott is able to land a contract that is more expensive than Wentz's deal, then it will likely financially cripple the Cowboys and prevent them for giving record-breaking deals to Ezekiel Elliott and/or Amari Cooper and force them to leave in free agency.
Howie Roseman and his front office were smart to get Wentz's deal out of the way as quickly as possible. Now all that is left to do is watch Wentz return to his 2017 form with his new offensive weapons and see if he can help the Eagles snatch their 2nd Lombardi Trophy at some point during his new deal.