The Amiga OS is good enough to use instead of using Linux. The Amiga as we all know has a shell command, mulitasks, has web brower support.. etc. The only reason why i suppose i would want to try Linux on a real Amiga is to if it can be done and what speed.
I currently run Suse Linux 10.2 on a dual boot PC system, but i will always keep my Amiga doing Amiga things with Workbench.. I actually prefer Workbench over Linux, but i will never go to Windows.