Yeah, it's a good long term investment, but if you are planning to receive it as your full salary and keep it for a long time, then where will you get your everyday living? Not all things can be bought with bitcoin. So if you are planning to receive your salary as bitcoin, I suggest that you go half fiat and half bitcoin, just to make sure that you have money when you need it since we are still far from the time when bitcoin will be used anywhere in real life.