When evaluating a deal, one of the first things that should be should be looked at is comparable contracts. In the past decade, there have been a few deals for top-flight third baseman.
Ryan Zimmerman received a six-year, $100 million contract from the Washington Nationals when he was two years away from free agency (h/t Associated Press via Sports Illustrated). Zimmerman got this extension following an injury-shortened 2011 campaign.
Evan Longoria has gotten two big deals so far in his career. The most recent, which he signed earlier this week, is worth $100 million over six years (2017-2022), and he still receives the $36.6 million that he is due over the next four seasons (h/t Los Angeles Times).
Miguel Cabrera also got a large extension early in his career, signing an eight-year, $153.3 million deal in 2008 (h/t Enrique Rojas of ESPN). However, Cabrera is not a perfect comparison since he was a first baseman at the time he signed the extension.
The last major deal to consider is Alex Rodriguez's 10-year, $275 million contract that he signed in 2007 (h/t Associated Press via ESPN). It is clear that the Yankees overpaid Rodriguez, but the deal still provides a guideline for what an elite third baseman can get.
Since the 2006 season, Wright has posted the second highest fWAR of all third basemen (h/t FanGraphs), and his fWAR is higher than those of Zimmerman, Longoria and Rodriguez. The only player that he is trailing is Miguel Cabrera.
Considering that Wright is closer to free agency than most of the other top third basemen that signed big deals, it makes sense that he would get slightly more money than them. Free-agency years are more expensive than arbitration years, and because of that, Wright deserves approximately $130 million over seven years.