I'm glad the government actually went through the motions to investigate the business case of such a venture before just jumping into it, though I can't help but wonder if they were overly optimistic about the possibilities.  Their business case is all about "transforming mobility" and "catalyzing economic development".  That MIGHT happen and would be great, but it is based off a lot of guesswork and projections.  It kind of has the feel of another UPX project.

Also even their own business case analysis found that it was only just barely economically  viable to build the high speed rail from Toronto to London and not all the way to Windsor, though they recommended the whole route anyway.  So even with optimistic projections about the economic benefit it isn't expected to be worth the cost.

Full report is here: 
http://www.mto.gov.on.ca/english/publications/high-speed-rail-in-ontario-final-report/