It's never going to happen for a million reasons. The big ones are...
1) With so few teams in the league they have to be in major TV markets and big cities. A) to draw from a larger pool of people to fill up the stadiums B) to sell this TV package (even if its streaming only) to have people in those cities who actually care about the games. Syracuse is far too small
2) Fans in this area don't support SU football and go to games why would they support NFL rejects and never-was type players? SU lets students in for free most games and they still don't go. And for college football we get FSU (with Winston and a Heisman Trophy level player) and Clemson (with Watson a Heisman Trophy level player). If the local fans won't support that, they aren't going to support an XFL game between Syracuse and Nashville with a bunch of guys who nobody has ever heard of or was a star a few years back at Jacksonville St college but isn't good enough to play in the NFL.
XFL is going to NYC, Chicago, pick a big city in Florida, pick a big city in Texas, pick a big city in California.