There is really nothing remaining of the old Cooksville that will have an impact on the BRT, A few building can go easy as they are due to be replace when development happens to a point a few can be relocated on the existing lands,
The city over the decades have kill a number of projects since they were more than 6 story tall. More proposals have come and gone over the decades and that starting to change with the coming of the LRT. There is far more poetical for that area considering this is Mississauga Downtown, not Sq One.
Since this is an ML plan to have continue transit on Dundas from Toronto to Watertown, an light BRT is all that is needed west of Hurontario for the next 50 years as there is no density on it to support a true BRT or even an LRT. Going east of Hurontario has the best chance to see LRT on it