I think Bumgarner could have a late career resurgence. Though, Farhan Zaidi is there so I'd expect better info to get to Bumgarner, and maybe he's just stubborn.
But I hate the sinker/cutter mix he has moved to, and maybe there is a lack of control to it, but he just pounds the middle of the zone with them. Everything is down, and it diminishes his curveball. He still has great spin, it just seems like he overreacted to the loss of velo on his fastball.