While I couldn't find more recent data on Grey Cup ticket sales, the fact that they already reduced game capacity by 3,400 in early September is not a good sign. Maybe they could rename it the Banjo Bowl just for this year and hope Rider fans don't notice where the Riders and Bombers are in the standings.

Capacity at Winnipeg’s Investors Group Field for the 103rd Grey Cup has been reduced by about 3,400 tickets, and organizers are still about 10,000 away from selling out what could be the lowest-attended Grey Cup in 20-40 years. “It’s still early,” Orridge said. “We’ve got the month of September, the month of October and even into November to sell tickets. So in terms of pace, it can vary market to market and year to year.”
http://www.torontosun.com/2015/09/08...to-get-serious