If you are asking people to change the way they work, it isn't enough for a product to be slightly cheaper or slightly faster or slightly newer. One needs to deliver a 50 percent saving in cost and improved reliability (or efficiency or functionality) to create space for one's product in a crowded marketplace. You have to be 50 percent, 100 percent better. Not just ten percent.
I have a theory that it's impossible to prove anything, but I can't prove it.