It was DOA before it hit the road as well on the route that lead to be cancel due to COVID. It should never return until the plan transit hub is built, if then. The 107 would replace it.I think that would be the Miway 100 Airport Express that runs now (pre-covid)
TTC has 2 option once the line 5 is open to Renforth.
Option 1: split the route into 2 routes with the 900 stay as is and another route to Renforth only.
Option 2 is to have the 900 stopping at Renforth in both direction with longer travel time with an extra bus or 2 to keep the same departure time.