The only way for this to be possible is if salaries were paid in BTC but were set in fiat or with some stablecoin. Otherwise salary negotiations would be a nightmare and the ever increasing price of BTC due to the surge in demand would make a lot of companies go bankrupt. Governments would also have to step in and apply regulations, a lot of them are likely to ban the use of bitcoin altogether.
Companies do not have to buy and hold BTC to pay people in BTC, and also don't need to provide a fixed amount of BTC in salary. It also does not have to be a nightmare nor would it cause companies to go bankrupt.
Companies could charge a 1% fee for exchange rates and convert salaries to BTC at spot price, this would not cost them anything nor would it effect them in the long-term. In fact, since 1℅ is above what most exchanges charge, they would profit the difference in the long run.
On a more personal level I would rather get paid in something with more stability, the world economy is somewhat rocky as it is, no need to add more instability to anyone's life.
You mustn't know the long term value proposition of Bitcoin and the short-mid term destiny of fiat if you believe that fiat is more stable than Bitcoin.
Do you know how inflation or monetary policy works and how while you hold money, it keeps its perceived "value" while the cost of everything you can get for it goes up? That's not stable.
