What if Elon Musk (if he ends up doing it) says he will buy Twitter, but will pay the 44 billion dollars for it in the equivalent Bitcoin.
He'd have trouble getting his hands on the bitcoin. Though bitcoin has a marketcap of over $1 trillion, a lot of coins are trapped in legacy or lost accounts like those owned by Satoshi. The amount of circulating coins is small.
I do think your vision will come true in the next decade, but it won't happen with either bitcoin or ethereum. It will be with some other coin that is liquid and has value and sufficient coins in circulation to make commerce viable. The excitement and challenge is trying to identify which coin it will be and get in early!
Nope, it is easy to get, but it might not amount to much Bitcoin!! The price would spike very hard :D There will always be liquidity enough - he can have what I hold for 44 billion if he wants :)