I tend to think of the M8 as a second generation digital RF, with the first being the R-D1, as there was ample time between the two models to make improvements and further develop technology. Aside from issues related to ergonomics (like the fixed LCD, lack of wind lever, and lack of a grippy feel), it represents significant improvements in terms of larger sensor/smaller crop factor, higher resolution, and higher build and image quality. Digital RFs are in their infancy (hopefully they will continue to flourish), but progress is probably slower due to less of a market and smaller resources for R&D (due to smaller companies in the field like Epson and Leica as compared to Canon and Nikon). Luckily dRFs came at a time when digital camera technology overall was more mature; the M8 and R-D1 are much better cameras than any of the early digitals (P&S and DSLR).
I much prefer the size and handling of a digital RF compared to a DSLR, so for now the M8 is the only current production dRF and thus the only game in town. And it's a good one. If I could afford one, I would get one even though there will be imminent advances in technology and a likely superior successor because it would more than suit my needs right now. Just look at the Canon 5D--groundbreaking in terms of image quality, sensor size, and price point at the time; but now everyone is sweating over the Nikon D3 with its high fps and crazy ISO levels. Actually, since DSLR technology seems to change so quickly, I would almost feel "safer" with a dRF in that the road to obsolescence is perhaps a little longer.
Lastly, I like to think of rangefinder cameras and their users as being "old school" in their very nature--we take our time and extract the best out of existing, proven technology. That's why I chose a dRF as my first digital camera and enjoy RF as a hobby so much.