Renowned investor Kevin O'Leary has predicted that the majority of altcoins will eventually become worthless and disappear, leaving only Bitcoin and Ethereum as the enduring cryptocurrencies. O'Leary's comments highlight a growing sentiment among some investors that the crypto market will consolidate around these two leading digital assets. His remarks were reported by Watcher.Guru, emphasizing the perceived long-term viability of Bitcoin and Ethereum amidst a crowded and volatile altcoin market.