I believe this is just the lastest in a long line of outsiders looking in and trying to speculate, but here it is FWIW:
NFL.com article
Buffalo Bills
Owner Ralph Wilson, who is in his 90s, has said the team will not be moved while he's still living. The club's succession plan is to put the team in a trust and sell to the highest bidder. Still, the club is negotiating a new lease and renovation plan, and its regionalization efforts have been largely successful. Thirty-two percent of the club's tickets sales have come from Rochester, an hour away, and Southern Ontario, and the league is interested in continuing to cultivate the Toronto market.
Down the line, could a new deep-pocketed owner swoop in, and whisk the team away? It's not impossible. But chances are, that won't happen any time soon.