Linux desktop migration challenges

Via Slashdot, an interesting study by Paul Murphy at Ace's Hardware on the costs of migrating from Windows to Linux. Murphy discusses the architectural issues around the adoption of Linux on the desktop and the challenges it will pose for IT staff trained at and accustomed to administering Wintel systems.

What does the arrival of Lintel mean in terms of the organisation's need for the Microsoft gurus who currently support the organisation's Wintel ([Microsoft] Windows on Intel) desktops? How does the typical MCSE skill set map to what will be needed to cope with an environment in which perhaps 20% of the servers and 80% of the desktops run Linux while the remainder continue to run Microsoft suites?"