If mass adoption occurs this will have a good impact on bitcoin, the price of bitcoin will soar. I agree with you, the bitcoin ETF is proof of legalization from the SEC that bitcoin is legal for investment. This bitcoin ETF is very important because it will attract many investors to invest in bitcoin. We are also waiting for the Etherum ETF to agree soon.
Bitcoin has indeed received clear legality, but you need to know that the risks involved in Bitcoin are still very scary, the SEC and ETF are only bridges that make it easier for people who want to buy Bitcoin, even though Bitcoin is legal, it doesn't necessarily mean that large companies accept payments using Bitcoin. because of the existing risk factors.
It is the government's responsibility to clear an asset legal, and it is up to the people and businesses to decide whether to accept that asset as a form of payment for their goods and services.
And besides, an ETF approval does not mean that the US government has made bitcoin a legal tender for their citizens, ETF approval simply means that citizens can now invest in bitcoin same way they invest in shares and so on, whom ever decides to start accepting bitcoin for his or her goods and services is doing so on his or her own accord, and even when the government declear assets like bitcoin a legal tender, citizens aren't forced to accept it for their goods and services, those who want; will, and those who don't want; will not.
This has happened in many countries, the government only allows bitcoin as an investment commodity, not as a legal means of payment. but for me this is a positive thing, at least the government has allowed bitcoin to be used as inspiration.
Bitcoin ETF approved is a form of SEC recognition of bitcoin for investment.