Of course, one of the “unforeseen” problems is that the tracks were built either too close or not far enough from the curb to allow parking, for any reason, to include temporary for delivery on the street in front of businesses. I’ve heard about this ‘almost boondoggle’ on the local radio here the last few years. And don’t forget about the several accidents of the test street car runs where the street cars have hit wheeled vehicles.
“Several accidents”: more like 12 in the space of a few weeks.
Streetcars are a niche/novelty option. They’ll work well in places supported by entertainment/tourist revenue. And then only as part of a larger multi-modal “mix” of transportation options.