With all the efforts to urbanize it and the possibility of LRT it certainly will be interesting to see what MCC looks like in 10 years.
I think the main problem from a pedestrian point of view is that not only are the roads too wide, there is a ton of space on each side of the road. So overall everything is far too spaced out. This seems very obvious, but at the same time, this simple fact means drastic efforts may be required to make MCC more pedestrian friendly. I'm talking completely ripping out roads and realigning them, creating entirely new city blocks. Also roads need to be connected, there are too many dead ends and areas that you can't easily get between. I think it could be done. Pedestrian timed traffic signals, bike lanes and good transit can only go so far, it has to be walkable in the first place for any of those things to work.
Look at the comparisons of the road grids in Mississauga and two of its more traditional nearby cities (all the same scale). So much more can be packed into MCC:
Mississauga:
Hamilton:
Toronto: