And a bunch of those seats were bought by some restauranteer there who is now trying to unload them. That will be a very neutral, quiet venue. Bills fans are already writing the season off, and won't be going in numbers to the game. Even if it's a home game for them, it's on the road. It's also a turf field inside, so that will neutralize any advantage for them there.
If there are more than 40K fans there, I'd be surprised.
Quotes on the subject:
"Years ago I went to the game when jets played the bills, one of the worst games I have ever been to. That same year I had season tickets to the bills. For the most part people just sat in their seats no one really got in to the game, nothing like a bills game at all."
"It looks like they decided to drop the capacity to 45k by tarping some seats in order to give the illusion of a sell out"
"The tickets are sold, they are now trying to dump them."
"The ultimate number is W's, and that’s what matters in Santa Clara. As such, Jed York does not own the 49ers; Russell Wilson does." - Paul Gutierrez