mining bitcoin, ETH pos(soon) or a 9 to 5 job
only 9 to 5 job give us steady income because in job our salary is fixed and we are not be able to make more earning unless our job manager ask. But mining bitcoin is a thing on which we get income depend on our work, if we do lot of work then our income will be more and vice versa. ETH need investment and if you have any then it will give you steady income because its price increase uniformly.
Well 9 to 5 jobs are also very scarce to find in certain countries especially the third world countries and so their only hope is working online and getting paid with bitcoins. I can't say 9 to 5 jobs are the only source of steady income but there are others which Bitcoin has facilitated its payment.