Of course it shouldn't be everyone's profession. Most people would and do fail miserably as options traders. A tiny minority though does make consistent long term money as option traders. What this tells us is that the qoute is refuted, because we have a counterfactual. There is indeed some rational system to the market that some people are able to figure out.
Just because the quote doesn't apply to everyone, does not meant the quote does not apply to anyone.
"The market can remain irrational longer than you can remain solvent" is true for me, for you, for the person who quoted it above, and for the median person reading it.
The fact that some people make a living off of attempting to beat the market, with...mixed success, doesn't mean that the quote is false.
