I think about this a lot, because I hope to convince someone to pay me in bitcoin at some point.

For the employer, agreeing to a fixed salary like 1 BTC per year, say, is obviously an insane liability to take on. So, that means the fixed component would necessarily have to be lower and the remainder based on incentives or revenue sharing or something like that (e.g. 0.5 BTC per year + 1% of company profits), but now the employee is taking on lots of volatility risk.

Maybe we'll see hybrid contracts, with a defined fiat component and a defined bitcoin component: i.e. 0.1 BTC and $100k per year. As fiat depreciates and bitcoin appreciates this converts from a primarily fiat contract to a primarily bitcoin contract and both sides are insulated a little bit.