I don't care if it lives on as old-worldy kitch like the San Fran cable car. There's something about that careening streetcar between the 19th century streetscapes. Widen the boulevards, build a ROW, add greenery and public art, but don't rip out the streetcar lines. We lose those and we lose an important part of the character of the city.
By retain the character, I'm not talking about strip clubs and seedy places at all. I do mean retain the architecture and fringe arts elements. More bistros, cafes, galleries, design shops. Don't allow the streetscape to be given over to faceless mass-scale condo projects that only the rich can afford. Basically, TO needs to retain its closest thing to the East Village, Greenwich, SoHo, and Tribeca.