Ethereum opened the doors for many new projects and provided a starting point for them. It would have taken them a lot more time to develop their blockchains on their own.
Yes Ethereum it is one of the reason why crypto world change but Bitcoin is the main reason why crypto is become more popular. Both are having a good blockchains developed so that lots of people are attract to it. Also both are gives lots of opportunity especially in financial, BTC and ETH are have similar blockchain so either you choose both or one of them are surely worth it. Bitcoin will remain first and Ethereum will second to it they're the reason why cryptocurrency will become more popular and successful.