Morneau states that the..."The rationale is that while many public infrastructure projects are not profitable on their own, private funds could be convinced to get involved if the government promised a negotiated rate of return that would make their investment worthwhile."  
The question is where is that negotiated rate of return payments going to come from?  If the investors are investing in roads, bridges, water, airports, etc. that are publically owned how will they get their money back?  Will we suddenly see a large percentage of these projects have user fees, road tolls, etc.  attached to them?  How has the public won then if that is the case?  What if the project loses money?  Who pays for scenario?  None of this has been answered.
Also who will continue to pay for the maintenance of these builds?  Will the taxpayer be on the hook for that while the investors have made out like bandits for the build have left town?