It's possible that the GTA could see a gain of more than 1 seat, while another area of Ontario with lower than average population growth could lose a seat.
It might be time to revisit the Representation Formula:
https://elections.ca/content.aspx?section=res&dir=cir/red/allo&document=index&lang=eRight now Manitoba and Saskatchewan each have 14 ridings, however Manitoba has a population of 200K larger (more than 1 electoral quotient -121K) than Saskatchewan. Should Manitoba (showing my Manitoba bias) receive one more riding than Saskatchewan ?
If Nova Scotia (with 11 ridings) in the future were to overtake Saskatchewan (14 ridings) in population, the current formula will still give Nova Scotia 11 ridings (10 based on population and 1 based on the Grandfather clause)