Until the new signaling is in place, having early Sunday service will be a dream outside of special events. Same goes for 7/24 service. Sending emails is a waste of time.
Once the new signaling is up and running, you can shut down one track and run trains in both directions on the other track. Down side to this, one track operation will see longer headways, but better than no service at all.
TTC could even do track work in the off peak time frame to speed up repairs or what every has to happen since we have a very old out dated system. Having small windows to do work is only going to have things cause more problems down the road.
Even station would see one track service at times to speed work up on them than close them down 100%.
When did TTC start late service on various sections of the lines as well close them down for a full weekend?? Only happen in the last 5 years or when A major issue rose before then.