Elon Musk's investment accelerate bull market and now the prices of all altocins (at least those from the top100-top200) should start growing. Ethereum still has enormous potential (despite the fact that the amount of transaction fees blocks it strongly) so I am sure that Ethereum will follow the Bitcoin price and we will see new ATH every day.
He did not accelerate bull market, MicroStrategy did. Elon Musks's tweets are problematic to me because they cause his fanboys to pump.
Also,,, he cannot take full credit for Tesla decision as that is not his money AFAIK.
Agree however that ETH will benefit the most, apart from Bitcoin.