Maybe it's just me, but if we truly see the (global) death of fiat currency, the inability of Elon Musk to sell a Tesla is gonna be among the very least of anyone's problems.
In general yes, but I think Musk's inability to sell Teslas is going to be a major problem for the particular person deciding whether Tesla buys BTC or not.
Nigera is suffering from high inflation and their problem is that they aren't mechanizing their agriculture sector. The end result is that they import a lot of food and fail to export their cash crops. If the government borrowed/printed money and used it to grow the agriculture sector they could actually stave off inflation despite increasing the money supply.