Bitcoin is not widely used and accepted at a moment so there is no point in accepting salary in bitcoins as to spend them we need to convert them to fiat first, so as of now its better to get paid in fiat money.
There are actually factore that a worker should have to considered like freelancer woker which bitcoin as a mode of payment being used is really good because of its efficiency and also no taxes being assumed.
No doubt taxes will be removed if you are getting paid in bitcoins but you will get higher income only if the price of bitcoin is higher and if it falls down then it won't make much difference.