you can probably do it if you traded bitcoin using technical analysis. Im a swing trader myself and i've seen some pretty decent profits from using trend channel analysis. of course there are also losses but for the most part im positive. if you get really good at trading it is definitely possible to generate a steady stable income from trading bitcoins
I don't agree that you can get stable income from trading as you will be also making some losses somedays and in that case your income will be in negative and you cannot be sure that every time you will be making only profits from trading.