Liquidity for bitcoin or any other crypto-currencies is not guaranteed.
If Elon Musk wants to sell his $1.5billion worth of bitcoin-s he will likely get either less or much less than $1.5billion back, even though the current price quote is higher than his purchase price…
People can do a slow and gradual exit but no one wants to do this while the price is still rising.
However any little rush to exit to fiat/paper currency by a small group of people will pop the bitcoin and other coins’ bubble…