Because there is always a better faster one around the next corner. I think it would be better to slow down the release cycles and focus on quality. And more on the quality of the lenses. Believe me, the glass is more important than the sensor. The lens has to deliver excellent micro-contrast, great colors, good resolution and a good auto-focus-performance. So Fuji is doing a good job by not releasing to much new models every year but throwing some awesome lenses on the market.