I understood from Alans comment is that he personally doesn't find them interesting as a hardware base from a productivety POV.
I think that is true. Watching a mm presentation or doing work is not what people buy a PDA for.
At the moment a PDA is mainly for entering data and accessing it again.
And games have been and will be on every hardware platform.
I think that the Amiga would best serve PDAs through the AmigaDE. AmigaOS would serve only as a 'Kickstart' type of system.