As an analogy, people globally speak thousands of languages. Google Translate, getting better all the time, intermediates with about 100 of them. Similarly, Changelly and Shapeshift intermediate between roughly 100 cryptos out of the 2000+. I think the Lightning Network is going to wipe out -- or reduce to meaninglessness -- most of those 2000+ once it really gets going, but in the meantime . . . .