The Bremner plan is a dumb idea, and it will be an operation nightmare where it connects to the existing tunnel under ACC. The line will go underground in front of ACC, which will have an impact on that area. The real problem is getting the cars onto and off the existing tunnel tracks when more cars will be using that tunnel after the extension to the QQ line east is done. This includes improvement of the existing service also.
Not only are you going to have more cars going east on the new QQ line for the Waterfront development, you are going to get some 504 cars running from Broadview Station by Cherry St. Maybe a few 501's also.
TTC wants to bring a Bathurst and Spadina cars along this Bremmer line.
Until TTC finds the money to build the mickey mouse new loop that only good for today ridership, not 2040, this line is dead.
As for the bus terminal, TTC has declare this as surplus land and being turn over to Built Toronto for sale. The Bus terminal days are number and could be gone within the next 10 years.
Where the new terminal is to be located has yet to be decided, with 120 Harbour location being the front runner, not the STQ site. This relocation has been poorly plan and looked at for decades.
The amount of ridership coming in from Long Branch will be very small to the point of having long headways.