I can only speak for myself and my experience, but a lot of people I speak to from my community (South Asian) treat Toronto FC as a 3rd rate product. They'll be very amped for the Man Utd game on TV at 7 am, but it does not translate over to TFC. I think a good first step would be to target those people and the simplest way is by winning. We have more than enough football fans in this city to make Toronto FC very popular and it starts by getting those Premier league viewers.
Having said that, I enjoy the camaraderie of being TFC fan with you fine folks!