It worries me, but definitely less than with Windows. The lock-in factor is a lot lower with Linux. With Windows, once you invested in the infrastructure you were pretty much stuck there for life. If you switched, you'd need all new software and maybe all new hardware (if your alternative was Macs).
With Linux, most of your software runs out of the box on other platforms. If you want to switch to FreeBSD, it's a fairly shallow learning curve and you can be back where you were before too long. If you want to try out Macs, you can run most of the same stuff on them, and switch slowly. Even Windows can run the same software.
With Linux, most of your software runs out of the box on other platforms. If you want to switch to FreeBSD, it's a fairly shallow learning curve and you can be back where you were before too long. If you want to try out Macs, you can run most of the same stuff on them, and switch slowly. Even Windows can run the same software.