Waterloo region has a plan to combat sprawl, so that's not happening any time soon. Guelph will sprawl regardless of whether this freeway is built or not.
It's a connection. There is pretty much no redundancy along this corridor, and competitive GO improvements aren't coming any time soon. Also, not everyone lives in Downtown Kitchener. If we're going to be building any highway expansions, this is the one to do. I don't even care if it's tolled, the alternative is far worse.
Pretty much all the roads are clogged along this corridor unless a 35-minute detour via the 401 is ideal.