What RFI-EMI-GUY said. Licensing among other things is representation. "Use it or lose it" applies. Often when the FCC considers new regulations for a radio service and issues an NPRM, the number of incumbent licensees potentially impacted by proposed rules is mentioned in the NPRM and is open for public comment.
^^^^^^^^^^^^^^^^Exactly what he said ^^^^^^^^
One of the main points of the last NPRM that resulted in the 2017 Rules, was the concept of "license by rule". This would have stripped individuals of rights (licenses) and made the entire GMRS service subject to change at the whim of FCC/Industry. In fact, the NPRM was suggesting eliminating high power operations and repeaters. As it is we are lucky we have all those.
"Use it or lose it" can apply even if we have licenses which makes it important to stay involved. The FCC is considering eliminating Amateur Radio operations at 3.5 GHz. Obviously, the Amateur Radio community had not made much use of 3.5 GHz so there it goes.
How many remember that GMRS included some microwave spectrum at ~76 GHz? Surprise, it once existed. Now that band is for automotive radar.