The question is can you afford him going forward. And to an extent you can.
He is signed through 2017, and he doesn't really have a signing bonus issue, so the vikings can easily trade him.
You take much of his 2013 and 2014 salaries and you convert it to signing bonus. Basically you throw all of his money into 2016 and 2017, and you basically get AP for a 3 year deal which is pretty affordable.
Basically boils down to 5 years 66.15 million, which is 13 million a year with heavy back loading. Anyone who tells you that we couldn't afford AP really isn't doing the math. Let me break it down for you in terms of restructuring his contract.
2013, you restructure his contract to 840k that way he fits under the cap. That gives you 10.41 in signing bonus over 5 years. His cap hit for this year would be 2.9 million.
2014? Well in 2014 you would owe him 11.75 in base salary + the 2.082 million in bonus. This is 13.832 million. That's a lot of money. Can't afford it right? Well wrong. We restructure his contract again. This makes his base salary 855k. You take 11.75 million and divide it by 4. 2.9375 million + 855k + 2.082 million. He costs you 5.8745 million. Now you're in 2015. His contract is 12.75 million + 2.082 million + 2.9375 million. You take the 12.75 million and you reduce it to let's say 860k (not sure what the minimum would be in 2015). 11.89 million divided by 3 is 3.96 million + 860k + 2.082 million + 2.9375 million which is 9.84 million. That sounds pretty high, but for an MVP caliber player who would just be hitting 30 it isn't terrible.
In 2016 you could try to work something out with his salary, or you could cut him.
Cutting him would cost 2.082 (2) + 2.9375 (2) + 3.96 (2) = 17 million in dead space, which you would spread over the course of two years, which would be 9 million a year in dead money.
So ultimately that is the question you would have to ask yourself. Is a couple years with 9 million in dead money (hopefully with a larger cap in those years) worth the chance to win super bowls in 2013, 2014, and 2015...
I would say yes. We just paid Anthony Spencer 10 million to do nothing this year. And he is no AP.
My question would be how much would it cost to get him in a trade. And there I would probably have a problem. If it was just a single 1st round draft pick, I'd do it in a heartbeat.