If anything, Denver's win has reduced the chances of the Bills making the playoffs to 20-30% let's say. Not to take you literally, but that's a lot different than the million to one shot of the lottery.
Nevertheless, as far as the decision here goes. I would highly recommend the Steelers game over the Indy game even if the Indy game was a sure-bet to occur. It's just so much more enjoyable to be around like-minded fans cheering for your team than to be in enemy territory. Maybe, that's just my personality though....