It was only a couple years between the 1998 Comdex and when I got my first wifi PalmOS device with a color screen. At some point my handheld devices acquired the ability to connect directly to a cellular network, which was nice, and then became really nice with the iPhone. But I don't think that was ever a planned feature for the WebPad in the first place.
The form factor is perhaps more interesting. We did have to wait 12 years until Apple legitimized the idea of a device along these lines that doesn't fit in a pocket.