A lot of linux companies are gone now but Red Hat is still going strong.
Red Hat is still going strong because they recognized IN THE BEGINNING the need for a very strong marketing and development push. They were the first to get boxes on the shelves en masse.
People LOVE the concept of a free OS, but people who use software WANT to see pretty boxes on shelves.
In regards to Amiga, it's all rather a moot point anyway. They (Amiga) aren't building an OS at all, out of anything. Hyperion/Eyetech are kludging together a desktop system (rather slowly) based on updating very old technology (Hyperion) using readily available MAI motherboards (Eyetech) and Amiga is simply using TAO's stuff and writing a game player for other PDA's.
Not many PDA owners I know understand the logic of needing to buy a third party player to play Java games on their PDA.