TTC will be face with some hard decision come May-Sept 2017 for production as they near the delivery of the 60th car and the current poor MTBF. TTC should have a better handle on the MTBF issue to the point they will know what is the biggest reason for it and what needs to happen to fix it. If it still a design/production problem(s), then production needs to stop to deal with the issue(s). No sense keeping producing cars with problems and hope they will be fix over time like the TR fleet, causing headaches for TTC from top to bottom, let alone riders.
The 6oth car is supposed to be the last car with poles. The delivery of the 60th car is supposed to be a tell tail point about ordering the extra 60 plus extra cars, but don't see it happening in 2017, as there is no funds in the budget to do so. That may happen in 2019.
The conversion to pans was to happen months ago and then push to the end of the year. A number of the main intersection still not converted yet as plan and will be early-mid 2017 now. Until King, Queen and Roncesvalles yard is 100% pan ready, poles will be use until the conversion is complete. We know 509, 510, 511 and 512 are pan ready with Dufferin and a good chunk of 504/501/514 that are ready for pans at this time.
Since the push is to have 509, 510 and 514 100% new fleet first, 511 should be the next line to be Flexity somewhere around June 2017. Is TTC going to stick with the roll out plan or change it and we will most likely find out early 2017. The goal I know was to move the first 60 cars with poles out onto other route as the pan only cars show up until the full conversion of the OS was complete for all lines. That still can happen late 2017 or early 2018 since delivery is so late.