I like the sound of this!
Though it has been promised in the past, it was never this well thought out. This may be the very first step toward real practical and substantial cloud computing for games. Knowing Nintendo's stance on 60fps gaming(necessary for many of their games) and low latency input response time - and *supposing* this is related to NX - I'm sure they would not pursue this route unless they believe they have the partners, tech, and years of research requiredto pull it off with respectable results(much like with Wii U/Gamepad lag-free streaming that left competitors playing catch-up for a few years)
Based on the proposal, and *if* this is NX related, each console or handheld device may have to be sold with at least one supplemental computing device. That would be necessary to ensure enough computing devices are available for extra processing power in the first place. Being able to connect multiple 'Sup-Coms'(lol, calling dibs on that short form now!) means Nintendo, if they choose to, could actually release even more powerful ones in the future(as still affordable prices) as cost drops.
Providing this works as planned, this would be an interesting way for Nintendo to provide a high performance device at an affordable price, while individual users are still free to increase the 'in-house' performance of their sup-coms via multiple linkages(and remote users in turn will benefit!). Seeing how impossible it is to release dedicated consoles that can compete with current PCs, have a small form-factor, produce relatively low heat, AND release at a mass-market price, this may be the only way for console makers to stay competitive. What's important now is that they make sure their approach is truly ready, and commit to it.