I can see the use of them for Workbench and e-mail access, but that's about it. iPods/iPads are great devices, I've used them and bought them as gifts, but I still can not see them replacing PDAs/LPDAs completely. On a per item basis they may be cheaper compared to the Symbol scanners, but the long term reliability isn't there to make them dependable enough to roll out roughly 350,000 new devices to all the stores in the chain. I've seen PDAs take a fall and keep on working that would make an iPod's screen crack just recording it. They would have to have a completely new support system put in place to handle repairs with that volume. Are they even capable of communicating with our mobile printers? What about hardware changes with future models? Would we have to replace the entire line every few years? There are valid reasons why you go with a basic, dependable product when it's something you rely on so heavily. What about theft by guests with sticky fingers around careless TMs?
Again, the device itself is great(and trust me, it's hard saying that as I LOATHE Apple as a company), but I just can't see it as a reliable, practical replacement for our established equipment. As a supplement device to those who need it sure, but nothing more.