Wouldn't be a bad idea for Line 6 to be the next SRT. Maybe then, we can actually improve transit on the corridor by getting rid of the dysfunctional tram line that made both transit worse and slower and road conditions worse and slower, decreasing the quality of commutes for everyone, and hopefully kill the idea of surface LRTs (garbage) ever being built in our city in our lifetimes.
Two Line 5 Shuttles zoomed me by on the surface section of the LRT today. On Tuesday's commute, I'm actually just going to take the bus instead. Nobody I know sees this and thinks "Oh, this line is a good reason for me to not drive" unlike how they view Lines 1 and 2 and they actually use that instead of driving.
As for signal priority, I'm sure the city will botch it given it's track record, and even if they improve it, can still in theory be removed if a future Provincial or local government thinks that it impedes traffic especially as traffic worsens in the decades ahead.
I've spoken out against them to the city and provincial government, got many more people to do so, and I will continue to do my part to ensure we don't deteriorate our city with half measures (that are actually taking us back half way rather than forward) just to please the few that have convinced themselves that oversized streetcars are somehow "a solution to our transit crisis".