The Trans Canada Trail is misunderstood conceptually, it isn't a great way to cross Canada, it's a way to connect Canadians. People need to understand the semantics of that — it's a shared facility that is imagined to stretch out to every province and territory. It is impossible to ride it end to end because significant portions of it are water trails. It's an idea that someone cycling a pathway in Ottawa is connected to someone kayaking in Thunder Bay or hiking in Banff or dog-sledding in Whitehorse because it is (or will be) a contiguous (but terribly meandering) line. You kinda have to be Canadian to get it Maybe that's why they're focusing on calling it the "Great Trail" because "Trans Canada" implies you can ride it coast to coast.
If you're bike touring, stick to the tried and true routes like the Yellowhead, the Trans Canada Highway, Route verte, etc., and when you stumble across part of the Trans Canada Trail from time to time, hop on and off at your convenience, but don't expect it to be all suitable for touring.