If Pegula is successful in purchasing the Bills and a new stadium gets built downtown, I am sure he could arrange a few Sabres Home Games against the Maple Leafs on a Friday/Saturday Night, when the Bills have a home game on Sunday. Downtown would be fun place on those weekends.
Another great site would be on an area near FNC. Move HSBC out, place a Hotel with Convention Center there with a new stadium bordered by Mississippi Street/SouthPark/Michigan/Scott Streets. A parking garage could be built to accommodate the lost of the surface parking.
This would be an incentive for the Senecas to build a similar hotel/casino structure to the one in NF.