Much better is to have multiple source of income, people need to have business that can produce income in everyday lives and also if possible to have full time job is much better then insert the earning in bitcoin. I think you can get the stable income on that methods.
Actually, doing multiple business don't grant stable income but bigger income instead. People would earn more if he do get passive income and alternative income at the same time.
Actually it kind of give you a stable income, even more stable than something like a full time job. Supposed that one of your multiple sources of income goes down, you still have income although it will be less. On the other hand, losing your day job will be chaos to you since it's the only thing that you have. I would really rather have multiple sources of income than have one boring day job.
Multiple sources of income gives you different stuffs to do everyday. You can do a site visiting today for source of income X, then meetup with a client for source of income Y tomorrow, and then just do some paper work for source of income Z. With a day job, almost every day is the same. Unless of course if your day job requires you to do different stuffs per day, but mostly the case is just going to the office and then call it a day at 5PM.