Yes, absolutely. Trading is great, but it's not passive income, rather a profession, so plans B and C are a must if we're serious about our lives.
Thinking plan A, B, C or whatever is faulty thinking. Your financial life should be a unified whole not broken into separate plans. You need core income, then different strategies and finally funds to speculate with. Remember if you don't shoot for big wins, you will never get them. There's reason that even the most skilled traders like DB the Russian turn to money management. Surf
Plans are supposed to be developed in parallel, to supplement each other, that's it. It's a common sense and responsible to have diversified sources of income.
Yes, that is ideal. However, many think of plans as plan a failed, now onto plan b, next c-- rather than running all of them at the same time in unison.
This is a great exercise and I applaud Dr. C for keeping it real. There's a wide gulf between Internet claims from folks like Shad, Hershey and taspurt and market reality.