Some questions....
Will the "non" AV's on Bay Street be the ones ultimately running on the Skyway track?
Economically, let's see... we are going to pay a specially trained driver of a 15 passenger vehicle at least the same dollars as one who drives a 40+ (I estimate) passenger bus. And, in a vehicle that goes at less than half the speed and operates only when the weather is nice

. How does the cost of one of these vehicles compare to the cost of a regular bus? How much is the added cost of the infrastructure and operations center adding to the ride cost? How will the operations center be staffed? Where will maintenance on the vehicles be performed and by who?
What happens when the "driver" improperly reacts to a situation created by the vehicle? How seamless is it switching back and forth between driver control and automated control?
What happens the first time one of these vehicles is in an accident, especially one with injuries? How much of the millions in liability settlement and/or the cost of such insurance dollars are figured in the budget? Will JTA reconsider after the public outcry and national news making?
How much demand is there for a ride down Bay Street, other than for events at the arena and the stadium? And, then, how will these vehicles navigate a street with wall to wall cars sharing the road with them? Or, the anxious fans jumping out in front of one to cross the street, even worse, while intoxicated?
I have driven Bay Street many times on this route to the stadium during business hours and find I mostly have the road to myself. Maybe that's why JTA picked this route?
Do the AV's need continuous wireless connections to the internet to operate? If that connection is lost, does the bus stop in its tracks? Can a hacker gain control of the AV?
Can these vehicles operate at night, in very low light or in a very heavy rain (especially at night?) as well as during the day? Can they be blinded by the sun?
LOL, how will they handle all the pot holes the City has due to poor road maintenance?
What happens if the road sensors get damaged, disabled or vandalized? Are there sensors to detect bad sensors? Does the vehicle come to a stop? What happens when vehicles stop in the middle of a lane for problems? Do they "know" to pull out of traffic, into a vacant lot or along a curb?