I've long felt that a downtown streetcar system should start with one on each of the 7s, then maybe a horizontal one (or light rail) along Mcdowell.
I know some think this is too close to the current lines, but consider the opinion of somebody handicapped, or over the age of 75, or even just carrying something - groceries. Car battery, or any number of reasons. In other cities, that distance is normal.
I know we're a more spread out city, but I think it's the right move to influence density - I do think it would help to have the lines make a couple turns for more area coverage in the neighborhoods even.
That's my thought anyway. I would absolutely love those ( and a line up to glendale