Re: "With linux becoming an OS that more people are experimenting with..."
I'll point out that I'm already running FrameMaker (and Acrobat) under Ubuntu Linux.
Of course I first have to use the free VMware Server to run W2K Pro in a virtual machine, and then run FM and Acrobat under that. I then use Samba to share files between my Linux host and W2K across VMware's "LAN" connection...
For what it's worth, my first experiments were with running FrameMaker 7 under Wine. FrameMaker ran well enough, but Postscript fonts, and by extension a FrameMaker-to-Distiller workflow, didn't run well at all -- the workflow was finicky and fragile.
Having said that, I personally tend to believe that it's pointless to imagine that Adobe can or will support FrameMaker on non-Windows platforms, insofar as the company seems to be struggling to bring a reliable Windows version of the product into the twenty-first century. That doesn't especially bother me because I don't see the future belonging to proprietary binary file formats virtually imprisoned in proprietary, stand-alone authoring environments...
Cheers & hope this helps,
Riley