From a basic competitive position, if the tax in a particular jurisdiction on a particular good or service is all the same and the compliance costs of collecting that tax are quite reduced, competition should naturally take its own course. I'm not sure the federal government is looking to find specific industries that it would benefit; I think your objective is to benefit all industries equally. All industries in, say, Ontario or Saskatchewan would benefit equally from the simplification of the sales tax system.
Your problem is overcoming the perception that individual provinces will be worse off after harmonization. The only evidence available is, of course, the three eastern provinces, which harmonized eight or ten years ago. Looking at the revenue trend in those three provinces, they're certainly collecting more sales tax now than they were before harmonization. There are all kinds of variables over a period of six of seven years that would go into the consumption tax yield, but it's quite clear that those provinces are collecting more now than before, helped a lot by the federal government agreeing to a monetary stipend to shoulder the blow.