Aren't there simply enough people in the field to make most IT workers (I include both programmers and "system administrators" in this category) completely inte

Aren't there simply enough people in the field to make most IT workers (I include both programmers and "system administrators" in this category) completely interchangeable? As long as the majority of the workforce, the bottom of the pyramid, is readily replaceable by a steady stream of college grads, there won't be much need for salary increase. Becoming irreplaceable, my guess is, is where the cash is.