70cm has been whittled down but it's still a decent sized chunk, and gets a significant amount of usage -- I didn't even realize how much until I got a receiver that could demodulate digital modes. 219-220 and 222-225 MHz has less usage but it's still enough for the ARRL to pitch a fit if an attempt to snag it happens, and 4 MHz of spectrum isn't very enticing.
Once you get below 350 MHz or so, internal antennas in a cellphone-sized device become impractical. You either have impedance mismatch + lots of loss that must be overcome with power, or the antenna needs to extend past the body of the phone. Nobody will go back to the 1990s with pull-up antennas, regardless of how well they work. I think once wireless has gobbled up all of UHF TV's spectrum, that will be it.
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