The Dillos in Austin will go extinct. I think I rode a Dillo one time when I lived in Austin. They were too infrequent and the interiors were uncomfortable. When discussing streetcars, people often say the Dillos don't work so the streetcars won't either. But here is a case where the routes changed and then the whole service will be cut. The permanence argument for the streetcar gets stronger in this respect.
It's good though in one sense, no one can call them trolleys anymore.
Flickr photo by Cackhanded