People use the word Bubble a lot and don't explain why they think this is the case, besides saying prices went up a lot or to fast. Well the prices have been going up for years and if Blockchain technology is the next big thing then that is the reason why. Whether or not Bitcoin will remain the number one is yet to be seen as there are matters that need to be resolved but like @jrcornel points out Mark Cuban is contradicting himself in a way.