And yet, as you said, he's still "on the market". My opinion of him isn't about his past sins, it's about the fact that he's not smart, doesn't study, and can't play anymore. And the league agrees at this point.
No he won't. Teams want to get quarterbacks up to speed in their system for as long as they can. You don't wait until the last minute at that position if you can avoid it.
Which is much more than Vick is getting. There's interest in Davis, none in Vick.
The Steelers had him last year, and despite their backups (including former Cowboys bust Dustin Vaughan) looking terrible, aren't bringing him back either.