I have absolutely no data or information to back this up, but I predict a RISC-V based Framework within the next 5 years. And I'll be one of the first customers to buy one.
First gen unlikely to be low(er) power though surely? I can see this emerging, but power would have to lie in the space of "premature optimisation" risks. For intel, AMD & ARM they're all multiple generations in, have understood their exposure of risk to parasitic effects in the VLSI of choice, have fab at viable defect rate. RISC-V is more played with in FPGA or emulation than otherwise. (happy to be corrected, but I think this remains true)
Yes I think frame.work is a good and reputable maker. They are indeed still young, but they've made and kept a number of big early promises, and have been consistently shipping. There are some bugs/quality concerns but I'm confident they'll work them out.
I've bought hardware before though from companies I'd never heard of, and either never received it or when I did it was much poorer quality than advertised or was so long after the order that I'd nearly forgotten about it. Would hate for that to happen with xcalibyte