Prior to Cardano, perhaps Solana would have been more appropriate to replace Ethereum in terms of GAS fees and with their fairly successful project building Solana to a level that was much more noticed by big investors. I saw after ADA created its own network and so far no significant development has been seen in the period after opening. In fact, the price is quite far from the price before they launched the private network. Meanwhile, Solana is already ahead of ADA in terms of development.