20-Year Prospect
While your tools may change (disease-scanning drones, anyone?) illness and infection most certainly will not. Every time we knock one out, another one mutates and we're back to square one. Well...you're back to square one, anyway.
The population is growing and our society is becoming more global by the day. Pump up your smarts, stick with the field, and in twenty years time, the only risk you'll be facing is whether or not your casual $20,000 investment in ShmarpBook is going to return more than 5% in three years.