Maybe they should just fill in the entire Bedford Basin (just leave enough for the Container Terminal). It would certainly alleviate some traffic issues in the HRM and maybe eliminate the need for a third Harbour Bridge. Plus it would create a lot of additional real estate.
(I wasn't being completely serious - just filling in the shallow portions is a consideration though)
Since Halifax and Dartmouth seem to be so strongly against development, the new centre of growth could be Bedford/Sackville.