cardano has total supply of 31,112,483,745 according to cmc out of which circulating supply is close to 25,927,070,538 as on date so if we make it 10$ a piece after 5 years then the total market cap would surpass current mcap of entire crypto market. also within 10 years we may see some cool new working projects with working models & actual interesting use case which may put these blockchains into oblivion so 5 years in crytpo is a entire generation & predicting that high is quite random & of no effect imo.