I think we agree on the 24/192 thing being foolish, but the one significantly positive aspect of Pono is that it would allow access to remastered recordings without the loudness-wars style compression (Californication being a great example). My hope is that it will be a market that you can safely sell high-dynamic-range audio to because presumably they value that over preceived volume.
Eh, I'm not holding my breath on that (though of course I hope I'm wrong). In all the Pono marketing material I've read I've seen almost no reference to (re)mastering; it's all been about chasing the hi-res dragon. Meh.