Earlier quoted context omitted.
Presumably, in El Salvador, salaries would be denominated in BTC. That's the only thing that'd make any sense. (And, barring external regulatory force, it's very likely to be what a free job market where employees mostly spend BTC would move to doing.)
I don't see why they would be denominated in BTC, given that BTC will be legal tender alongside USD, and USD is a much more stable currency. Making it a legal currency won't even force anyone to accept it. As far as I understand, it will simply mean that the government will accept payments in BTC.
The telling thing would be what the gov't pays in (e.g., for tax returns). Do they pay you back in BTC? or fiat?