One could also use longer streetcars or chain the streetcars into LRT type trains -- this has happened to some former streetcar routes elsewhere in the world.
You could hold off double-ended operation except for longer trains. Kind TTC would be a candidate for eventual complete LRT conversion since it will intersect with 8 subway stations (once all new stations are built, Ontario Line, Liberty GO, etc).
What are your thoughts on local frequent-stop services if high-ridership streetcar routes were to LRTify? In an ideal world, I feel like there would be "local" and "express" streetcars along routes like King rather than just eliminating half the stops and forcing people to walk, or ride a bus along a route that realistically shouldn't have cars anyway, but good luck finding political will for an initiative like that (converting an arterial to streetcar-only).