money-making jobs of the future

I'm reading Alister McGrath's Christianity's Dangerous Idea, and I came across this passage on page 39:

Martin Luther was born on November 10, 1483, in the German town of Eiselben, the first son of Hans and Margarette Luder (as the name was spelled at this stage; it was later Latinized to the more familiary "Luther")... Having himself risen from the ranks of the German peasantry, Hans was determined to see his son rise still further and bring both status and income to the family. He began to plan his son's future. He would become a lawyer - then, as now, a career with excellent financial prospects.

And, it led me to think: what present-day careers will still exist - and be just as lucrative, or perhaps more so - 500 years from now? Obviously we will still need doctors and other healthcare professionals in some form or other. I'm betting that we will continue to have clergy members and religious leaders as well, even though Richard Dawkins and Christopher Hitchens probably hope that we won't. I don't know if it's quite so obvious that we'll have lawyers. Maybe our societies will be such that every law is perfectly clear with no wiggle room, so lawyers will be unnecessary.