There's been no shortage of series racing at Exhibition Place in support of Indycar (
http://www.hondaindytoronto.com/eventschedule). Canadian Tire Series has run there before as well (like they did at Edmonton for a while), that's not a new thing. Road America drew a good crowd so I don't think the product is an issue.
Tickets have just started to go on sale for 2017:
http://www.hondaindytoronto.com/more...ay-november-29