For me, only really hard, to make one solution, which will be market viable, mean, will sell on real open market in quantities enough to make project profitable

For me, only really hard, to make one solution, which will be market viable, mean, will sell on real open market in quantities enough to make project profitable. For example, it is possible, if we consider some fantastic scenario, in which some big rich country will totally prohibit all other architectures, and enforce all people to buy only this. But I only know big poor countries, who could consider such experiments.