That's like saying "I leased a classic cadillac, and it ran ****ty for 6 months, and then I had to leave it in the shop for a month, but it's run fine these last two weeks. I better make this a rent to own, because how often do you see one of these on the open market?".
Bradford might run ok for a while, but his statistical best season, honestly his best season ever, in terms of yards, completion percentage and yards per attempt was last year. He was pretty close to his touchdown total. And this was in the "Chip Kelly, QB friendly, let's have eyepopping QB stats" system. He was 7-7, threw for 19 touchdowns and 14 interceptions.
I hate to see what happens when he breaks down.