Well talking about wide angles, this is exactly the same situation with the Canon or Nikon. If you were used to having a wide angle end in your 24-70, you needed a new lens, so people bought 17-40s instead.
In the SLR world everybody complained for years that they had to buy new lenses. Eventually those who weren't bothered by the crop factor were happy with their cameras, and those who were bothered either saved up for full frame cameras or stayed with film. The complaints eventually died down: those who didn't see a problem were happy with their cameras, those who saw a problem decided that it's someone else's problem, and those who just wanted to argue found other things to argue about. I guess with digital rangefinders we are now experiencing the same with a few years delay.