Although its an interesting idea, they're gonna have to make it as bombproof as they can. I believe bombproof for this gizmo will be lacking when compared to dedicated switches.
Think about it. If a cell phone can start acting weird after a year and cut you off from comunications, what can happen to the device controlling all your vehicle's auxiliary systems.
Sure, its not going to leave you stranded, but it'll leave you without lockers when you may need them most or without your compressor for airing up, or without aux lights when you need them..
If an overlander's mantra is to keep things simple, sometimes taking it as far as using old vehicles because they have less things to fail, why would you install one of these things?
Its going to take a while for ARB to make this work, and even then, I doubt it'll become mainstream or even somewhat popular in the near future.