If the salaries start getting higher and higher, and wages in other industries continue to stagnate, then more and more people are going to
start getting interested in programming, natural inclinations be damned.
Let's put it this way: how many people who go into investment banking are actually interested in investment banking? How many fooled around with financial models in middle school, then realized they wanted to parlay that passion into a career at Goldman Sachs? Maybe the odd freakshow here and there, but by and large, people enter the field for the moolah.
Right now, programming is still dominated by people who became programmers because they enjoy it. That they're well compensated is nice, but many of these people would probably be programming even if it didn't pay handsomely.
The Market Economics Fairy would indicate, however, that that'll change eventually. More and more would-be business or marketing or even journalism majors are going to choose CS when the salary average disparity becomes wider and more widely known.