While we're talking pagers, a few things I've wanted for years:
1) A hybrid voice/alpha pager. Our dispatch gives the location of the call, why not have something like a Minitor V with an LCD screen in it that could scroll a message entered by the dispatcher (and sent along with the voice or tones)? Just enough text to get a message through, like call type, address, and time?
2) A pager with multiple channels. Yaesu (Vertex) made a ham portable that was the same size as a Minitor and did VHF/VHF UHF/UHF or VHF/UHF simultaneously with a transceiver and a second receive-only radio. So you could monitor one frequency and still get pages (if that were built in to a pager).
3) A pager that acknowledges pages. Your pager receives a page, it transmits back some ID code to say that it received it. Or, even better, to get rid of all those IAmResponding.com-style systems, or calling the desk, has a button to press to send back a "responding" signal. Sure, no antenna, no good transmit coverage, but that could be worked on...