It's becoming obvious that Kitchener-Waterloo's main street retail is dying and the LRT is empty because not enough people live along its route and in their downtowns. Midtown has enough space for another 100,000 people:
Grand River Hospital and St Mary's hospital should merge into a super hospital near King and Victoria along with a large new central library and recreational facility. That frees up a lot of land for intensification: Berlin Square and Midtown for example.
There's plenty of other space in areas nearby for another 500k people without destroying neighbourhood character homes. eg the Belmont-Glasgow corridor, Weber and Union triangle along the train tracks, uptown and downtown parking lots, Victoria Street from Westmount to Breslau.