The reality is that our season was de-railed by injuries to Big Ben last year. Leftwich Ravens game, Batch's Browns game. Big Ben misses too many games not to have a young up and coming QB behind him.
Gradkowski will fill the role of a veteran that can win a game for you, but the next year (hopefully) it will be Landry Jones stepping in to get some exposure and win a game or two.
3 or 4 years down the line, hopefully he shows enough to warrant keeping for the long haul.