Well, the NFL is considering holding
Superbowl 50 in LA even though LA doesn't have a team (or a modern stadium) and is considering holding a
Superbowl in London, England so IMO if the NFL can do it, why not the CFL? You'd have to get the Commissioner and the 8 CFL owners to sign off on it, so there would have to be something in it for them. Probably $$$. Anyway, the Grey Cup is usually a neutral site game anyway.
The biggest problem in expanding the CFL is that there isn't a suitable stadium anywhere in Canada for a 10th team. If the CFL really wanted a 10th team, Mark Cohon should just dangle the big carrot and say "The first city that builds a modern 25,000 seat stadium with room for 15,000 temporary seats will be awarded hosting rights for 3 Grey Cups in the next 6"
3 Grey Cups might justify the construction of a $150 million stadium in Halifax or Quebec City. Calgary estimated that there was $80 million of economic impact from the 2009 Grey Cup. So 3 Grey Cups means $240 million of economic impact in addition to the $150 million construction project. Maybe I'm oversimplifying, but I think that makes about $390 of economic impact.
The 2014 CWG bid estimated a $2 billion economic impact for $785 million budget. That's $2.54 of economic activity for every $1.00 spent. 3 Grey Cups would have $390 million of economic activity for a $150 million budget. That's $2.60 of economic activity for every $1.00 spent. So in my mind, a Grey Cup Stadium makes as much sense as a CWG, but at less than one quarter of the CWG cost. It would have lower international exposure, but IMO would have more Canadian and North American exposure for HRM.
Then there would be a brand new 25,000 seat stadium waiting for a 10th team.
Everyone wins. Halifax gets a stadium, 3 major sporting events and economic activity. The CFL gets a brand new venue for a 10th team. A prospective owner gets a modern stadium for no upfront investment.
This is a big $$ plan I can support. I have no idea if it would fly with the CFL, Peter Kelly or Darrell Dexter. Probably wouldn't.