A few observations:
- Steinberg (the article's author) conflates render farms with desktop Linux. "There are massive deployments of Linux desktops. Animation studios have been switching their render farms to Linux." Render farms have nothing to do with desktop linux.
- At least one of the major deployments (Munich - http://www.wininformant.com/Articles/Index.cfm?ArticleID=39614) has LInux users running VMware (cough cough) so users can access Windows.
- Linux is not a unified platform, or a platform at all.