Rational? Not really. Not at the level being seen, anyway. Take away the innovative viewfinder, which overcomes many of the frustrations of recent digital camera designs, and it's a pretty unremarkable design with an undoubtedly good fixed lens. The viewfinder technology can, in time, be acquired by copy, design or licencing by other manufacturers and we can expect other cameras with similar viewfinders and other desirable features to appear. My prediction is we'll see some by by the end of 2011. So the X100 will have the same limited life and cost erosion seen in all digital camera designs, I think.
Also, Fuji have a track record of introducing innovative cameras with fixed (and good) lenses but ceasing production of them after a time. I'm expecting the Bessa III/GF670 to go the same way before long. All those waiting for the flood of cheap 'users' coming onto the market might be left empty handed. Fuji may change their policy at some stage but right now, this stage - the X100 - would have been a good time to make that change and they haven't, so I'm not holding my breath. A lot of posters have held forth at length about what they'd LIKE Fuji to do but that's a whole lot different to Fuji adopting a new marketing/production paradigm. Wishing and hoping won't get it! My guess is that they'll make it the way they want to make it and have designed it, and then stop making it after a year or two when the market moves on. And there's no guarantee, based on past performance, that they'll replace it with an updated model.
The other thing that's not entirely rational is the intense level of speculation, advice, flaming and fury over technical features, affordability and other assorted posts that seem to appear in RFF whenever something new and interesting is announced. I refer again to the introduction of the Bessa III when a similar thing happened. We seem to bring out the worst in each other and the level of rancour and abuse that passes between some members departs a long way from the item under discussion and assumes a life of its own. (And my own hands aren't altogether clean on this issue, before anyone reminds me!)
We're a very opinionated lot, and sometimes we need to be reminded that our own truth is not necessarily everyone else's truth and that what is self-evident to us is mere puffery and pontificating to others.