How do we move beyond the existing community?
IMO, get at least Mozilla and OpenOffice ported to AmigaOS/compatibles. That would get the attention of Slashdot users as well as techie-journos. It would certainly make Amiga/compatible platforms a far more realistic choice for newcomers. An increased userbase will coax developers into taking a serious look.
It's not going to be something that happens overnight. I reckon the process will take at least a few years before noteworthy amounts of newcomers become Amiga/compatible users (and maybe not as their primary platform, but having the hardware, even if they dualboot with Linux, is a start).