I think Bert will be good (perhaps rarely great) on any line as long as he realizes that no matter what line he's on, he has to screen the goaltender, bang in rebounds and retrieve loose pucks. Again, a GOOD fit, but rarely great.
If he'd actually do that, and at a price similar to this year's, I'd be ok with him. Though I'd still prefer someone younger.
What I'd expect, however, is that he'll be slow, not very physical, take dumb penalties, show a few flashes of skill, a few flashes of suck, and tons of mediocrity.
If he does come back, I hope at the very least it's cheap enough that we can afford to carry 14 forwards.