What bands are you talking about? The spectrum map doesn't seem to show the wholesale wasting of spectrum you seem to imply, especially in the GHz range which is most useful for cell phones et al.
As you mention police, I'll also point out public service frequencies (Part 90) recently went to 12.5kHz bandwidth (half what hams use) and there is discussion of going even further.
The really legacy allocations like broadcast TV, AM radio, and radionavigation are in spectra that Johnny Startup probably isn't interested in. Data rates are pretty slow at 30kHz.
As you mention police, I'll also point out public service frequencies (Part 90) recently went to 12.5kHz bandwidth (half what hams use) and there is discussion of going even further.
The really legacy allocations like broadcast TV, AM radio, and radionavigation are in spectra that Johnny Startup probably isn't interested in. Data rates are pretty slow at 30kHz.