[haebom]

Is the greatest challenge in adopting this new hardware architecture the technology itself, or the lack of an existing developer ecosystem and software toolchains?

[RetroTechie]

Both. In general, hardware development is harder & more costly than software development (although it does depend on what you're doing & how).

Lack of software tools can be overcome. But lack of eg. a game library is a bigger problem. Unless it's really easy to port titles somehow.