one big hinderace to any street car line is TransLink would need to run it. as it is now, no one is allowed to make transit that competes with TransLink. either the law would have to change, or TransLink needs to do it. highly unlikely either of those happen.
in 50yrs i could see a cut & cover SkyTrain line go under the RoW and then walking/cycling above to feed from West End - Broadway - 41st Av - Marine. but thats all fantasy and most here probably wont see it in their lifetime.
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it was a good thing to keep the corridor and not let it get developed since it has lots of benefits to a city. our version of the High Line so to speak. though it will never compare with that.
as for Gergor/Vision. they did cancel the planned rebuilding of the DHR from Cambie - Science World, along 1st Av. thats why all the poles are titled back slightly. they were installed prior to the cancellation, and so the weight of the gantry would have pulled them straight.