No fallback path, but I've started to think about such possibility this year. I guess I can do telecom support, as in doing physical wiring, installing hardware in cabinets, tuning signal etc. Being a QA on telco project gets me maybe 20-30% of the skills required. But I suspect the pay will be crap, work hours a lot more than 40/week and hazardous working conditions at roofs, basements, in any weather etc.

I would probably not start a business due to lacking initial capital, and not having a fallback option for that failure. And I don't have even clue what to do which is not immediately bankrupt.