As usual, adma has nothing really relevant to contribute.
However, in case you're truly wondering who these people are... As a favour to friends and a family member, I used to host delegations from Asian universities and Asian financial and industrial institutions. So we're talking very well-educated and sometimes well-travelled people. Not once did I EVER hear anything about someone wanting to see a Toronto streetcar. If anything, they wondered why Toronto still had vehicles stuck on tracks on the main roads.
In any case the only time I've ever heard an out-of-towner saying they want to check out a streetcar in North America was someone going to San Francisco. In Toronto, it's not even on the radar.
BTW, I'll add to the above list. Some people coming to Toronto also seem to know about Toronto's reputation as a foodie and theatre destination. They come here specifically to see a show, and while they're here, they want to sample the various restaurants.