Come on Jeff, the river just went below 2.3 today, and barely, it's far from "pretty much gone". At 2.3 Upper Mish still had some sweet surf waves, as did Bridges and the latter part of Poudre Park. You're just pining over it going below 3' (ok, 4'!).
And yes, Pineview/Bridges is totally runnable at 0.5', Bridges at 0.3', even I haven't tried lower than that! Though I don't think I've ever done 30cfs on Narrows, Gannon wins that one. I know I've boated Upper through Lower Narrows ~5-6 years ago at 0ft. Green Bridge rapid sucked. The rest was surprisingly good.
That said, my impression of the "new" Lower was it wasn't nearly as good below 0.5' as the old Lower was.