I think you're a little too optimistic. Even though Cardano is a great currency, with a huge project and an experienced team, and even if it successfully launches PoS, it will be impossible to become the most traded currency crypto. There are many people who think that Bitcoin is the only crypto currency, being a representative currency for the crypto market. I think Bitcoin will be used as a means of payment worldwide, being the most traded currency anyway. It is impossible to lose the 1st place in the coinmarketcap.