I wouldn't want my salary to be measured in BTC. If you got hired in December, when the price was $900/BTC, at say 1000 BTC pa salary (so $90k pa), these days you would be on a $60k salary.
No, this service would useful if I can get paid in Bitcoin, and pay for a majority of my expenses in Bitcoin, without having to convert to fiat at any point. Unfortunately, the Bitcoin ecosystem is nowhere near this sophisticated yet.