It's only a matter of time until many companies will start paying their employees with satoshis. I think that there are companies like the exchanges that will either allow the employee to choose the payment method, whether it's with satoshis or with fiat.
I doubt it because bitcoin is not a legal currency and not everyone knows about it. Using Bitcoin to pay salaries would be more feasible for cryptocurrency companies than for traditional companies.
fiat is more widely used and I think it's because of government regulations where most are not allowed to pay salaries in satoshi.
It is convertible to fiat and so those that have no problems receiving it will simply choose to get paid in satoshis.One of the pros on this is we get an instant BTC holding and investment if we don't spend it.
But it would be disadvantageous if that money were used for daily living expenses. The worst thing would happen if you just got paid in bitcoin and the price suddenly drops 10% or 30%.
Meanwhile, receiving payments in fiat is more proactive and less stressful as there is no need to worry about the price of bitcoin. We can easily plan our spending and buy bitcoins at a better price if we know how to analyze the market.