Golden finance reports that, according to Assemble AI, Coinbase's report predicts a significant altcoin season in September as Bitcoin's dominance declines. The report notes that Bitcoin's market share has dropped from 65% to 59%, and early signs of capital rotation towards altcoins have been observed. Although the current altcoin season index is only 40, well below the 75 threshold, Coinbase remains optimistic due to the expected increase in liquidity.