Call me crazy, but I think both Beason and Gettleman want to see him play this year in order to gauge his contract versus other 4-3 OLBs. Since Beason was a MLB when he got that contract, playing OLB this year will better determine how he measures up to other OLBs and thus how "off" his contract is.
If he can be as productive as, let's say, I don't know, (pulling an OLB name out of thin air) Lance Briggs, then a restructure is probably going to happen.
If he blows up QBs and gets 12-15- (I don't know) 45 sacks like an OLB in a 3-4, then he'll want even more money and he'll probably be cut or traded.
If he blows out a leg again, he'll HAVE to take a pay cut or be cut.
If he's just another guy out there with average production, it's also take a pay cut or be cut.
That's a lot of ifs, and only a season at OLB will provide the answers. Frankly, he's done enough for this organization to deserve that chance, and I'm glad the team has enough class to let him determine his future.