We have to learn every day.
Being blacksmith making horseshoes was "secure job" for hundreds of years. But with automobiles, within couple of decades, it suddenly wasn't needed. And most blacksmiths became "dead meat" overnight.
In online World, everything changes within months. If we don't learn news stuff and explore the online World, we can become "dead meat" easily.

I'm in online biz for about 15 years, and I've found myself losing track everytime I because lazy or just selfassured the business I have would last.
Ask MySpace developers & investors :)