If the person choosing what to do with their life is able to see an existing opportunity which is better than education then they should choose it, why would they not?
But if they are unable to see such opportunities then choosing to become more educated is not a bad choice provided as is the case in this situation that it does not present an additional financial burden.
One could even argue that the set of options one should consider when weighing opportunity cost should only be composed of the options to which the decision maker is aware (can reasonably be expected to become aware) of.