It's really scary to watch all the critical downtown transportation systems reach capacity or require immediate replacement all at the same time that downtown employment and population growth hits a historic high. It's kind of like finding out you've lost your job on the day your wife tells you you're going to have twins.
Toronto's transportation mess is a mess of its own making, but I don't know if anyone could have predicted that the Gardiner would fail at the exact time that a DRL is badly needed, at the exact same time that additional passengers from the EC and Spadina extension begin to flood whatever room we have on the YUS. It really is a clusterf**k in the making.
We have two saving graces right now: new streetcars (so, downtown-only passengers get a minor reprieve in capacity, if not travel times), and GO (so, more 905 passengers can stream into the downtown core). I'm afraid that GO's ability to relieve the TTC can only go so far: for one, the EAs for all day service on the other lines is proceeding too slowly for comfort; secondly, GO is not a proper rapid transit system, and still thinks of itself as a rush hour commuter service. Despite the fact that service on the Lakeshore has been boosted to half-hourly service, the lack of fare integration with the TTC and its connectivity to other transit within the City of Toronto probably means that it hasn't significantly changed travel patterns for people who live in southern Scarborough or southern Etobicoke.