Capital Vs labor Who risks more?

http://yosefk.com/blog/capital-vs-labor-who-risks-more.html

The interesting part is on labor's risk

• The worker's big risk is choosing the profession. Higher-income professions often require a more expensive education. If the demand for the skills drops in the future, the income might fail to cover the worker's investment into acquiring these skills. Assuming that learning ability drops with age, the risk increases proportionately.
• Moreover, this risk is not diversified. Even a small-time investor can spread his risk using some sort of index fund, betting on many stocks at a time. For a worker, on the other hand, there's no conceivable way to be 25% lawyer, 25% carpenter, 25% programmer and 25% neurosurgeon.