According to some people who sit around doing research, or something, all day have decided that the PDA market is going to disappear. Instead it's going to merge into other devices like cell phones.

The traditional PDA is heading for significant declines in sales, and in fact is nearing the end of its life as a major product segment, according to In-Stat. Shipments reached only 8.7 million units in 2004, down from 10 million in 2003, the high-tech market research firm says.

The outlook for upcoming years is not good, as the PDA market will have a negative Compound Annual Growth Rate (CAGR) of -21.5% during the 2004-2009 period. By 2009, it is expected that this segment will be composed of devices designed for specific vertical markets and low-end products. The market decline will occur as users switch to other products, such as smartphones and portable media players, a natural evolution of the category.

At some point, the PDA will become other things, more than just a PDA as we are already seeing this happen. I think even full grown computers will shrink down to PDA size.