IMHO, the only viable area in DC/Burnside at this time is the part bounded by Wright, John Savage, Commodore and Findlay. The areas around Ikea are already being developed and the area south of Commodore has a lake which would probably prevent a stadium being built there for environmental reasons, I'm thinking.
There is also a huge area north of the 107/Correctional facility/Akerley that is undeveloped, but not sure of the land use rules there.
https://www.google.ca/maps/place/Dar....5643241?dcr=0