Nursing is only lucrative in California and Boston. If you're anywhere else in the country, the pay is generally abyssmal compared to the responsibility and the stress. In what other industry can you work 12 hours straight and barely have time to go urinate, much less eat a lunch. At one point in my career I could eat a Big Mac in under 45 seconds. Why? Because I had to. That's literally all the time I had to eat.
I'm not leaving nursing to go work in a cube farm. I'm leaving nursing to be a serial entrepreneur. I'll be able to work 2 or 3 days a week, and spend the rest of my time coding and starting a business until I can get paid enough to devote full time to the business.
So, what is the worst that can happen to this young man? Taking a year off to live off of savings to start a web app. Please, if I have no imagination, tell me what your worst case scenario is.
I know that parents get awfully nervous about this sort of stuff. But... sometimes they just don't understand. Especially when it comes to technology stuff and the tech biz.
If you have the money, and can give a startup a shot.. go for it. What's the worst case scenario? The worst thing that can happen is that you'll have learned a lot about starting your own business, and you will have learned a lot about new technologies, and your savings will be gone. That's it. That's the worst.