No, Adam, in my experience anyway, I didn't think my new M9's sensor would have to be replaced in a few years. On the other hand, I didn't drink the kool-aid kudos about transcendent Leica goodness. Stuff breaks. When it happened I felt bad, got over it, got the camera fixed, and kept shooting. Fixing stuff is just part of the deal. I've had lenses repaired, cameras repaired, lighting equipment die, tripod heads get funky, you name it. Is any brand immune from failure modes?
I didn't buy Leica for its reliability, anymore than any other manufacturer, I bought it because it is, in my judgment, the best platform for some of the lenses I own. I do feel the reverse: that Leica equipment is actually more demanding and fussy than my other gear, so I guess I've managed expectations well relative to sensor failures, motherboard crap-outs, and everything else.
I've had sensor problems on two Canon cameras in the past 5-6 years, by the way, the only other digital bodies with which I have a fair amount of experience. One was fixed under warranty, one I paid for myself. One CCD, the other CMOS sensors, series 1 bodies. Cover glass delamination, both times. Not unique to Leica that's for sure.
Well, all I can say is that, if you want a niche, one-of-a-kind product like what you described, be prepared to pay for it, including the premium service necessary to keep it working. Any other attitude is naive. Buy a premium mechanical watch, be prepared to service it expensively every 2-3 years. Buy a premium, high performance automobile, same. You want lesser entry and maintenance costs? Then buy that Nikon with the Sony sensor, sell your nice M glass, and enjoy the savings. Easy. Or buy an alpha-series Sony body, adapt your M glass to it, enjoy the EVF experience, and watch your corners go to pieces and point light sources turn to blobs at least some of the time. Or shoot film with mechanical cameras where, yes, reliability is more assured because the technology is, well, low, less expensive, and more stable.
C'mon, do you really believe the blog pundits like Overgaard and Leica's own silly propaganda? It's all marketing (read: pretty lies). Realistically, digital M bodies represent a specialty entry in a limited market, this optical finder-based, full frame, sexy, small platform for your tiny powerhouse M lenses. It's gonna cost me, I knew that going in. And it hasn't disappointed me, either its repairs or the fine photographs it helps me make despite my shortcomings. I expected it.
Enough, sorry.