if someone sold a new palmos device that ran on aa or aaa batteries i would buy one in a heartbeat. for all it's limitations it did certain tasks very well. memopad, calendar and contacts. writing in graffiti 1 was fine for entering small amounts of data and local sync to a desktop with the cradle worked perfectly to sync data between multiple desktops.
wifi and bt to link to your network or phone to access data would be excellent. a shame there'd be no avantgo for mobile offline web which i absolutely loved on palmos. sync before you leave the house and i'd have news downloaded for the day to keep the boredom away.
with just those 2 protocol it could link to devices and services for many years without been dependent on special hardware to talk to the phone networks.