If you were willing to take Linux admins and cross-train, sure I could see that. But a lot of companies tend to ask for x years of actual experience with the pr

If you were willing to take Linux admins and cross-train, sure I could see that. But a lot of companies tend to ask for x years of actual experience with the product, and there's far more people with that in Linux than Any proprietary unix. The hardware is another factor too of course, the cheap X64 server being "good enough" inevitably moved people in that direction.