"...if it ain't broke don't try to fix it.", that is the thoughts of the FCC. They really don't want to get involved voluntarily with CB unless forced to do so. If they are forced, rest assured that it's about violators. Using FM mod and CTCSS tones will undoubtly never happen state side.
Exactly. The FCC isn't going to do anything about CB unless pushed. CB isn't "broke", it's at a stasis. No increase demand for spectrum or equipment, and no new added usefulness. As it is, nothing is going to change.
My point is -IF- someone was to change one of the variables, things would shift. Since the FCC won't do anything, that leaves it up to the American people or the manufacturers. Most of the public has forgotten about CB, so unlikely anything would happen on that front. That leaves the manufacturers as the only likely ones to initiate a change. Adding something new, like FM, would create enough of a change that there would be a perceived need for customers to go out and buy new equipment, or at least the dealers to charge more for it. Who would gain from this would be the manufacturers, dealers and users.
Unless something like that happened, there isn't much of a catalyst for change. There isn't much more that they can add to radios to generate sales, so there isn't much of a need for them to change the current designs, other than to do some cost saving design changes, or add new blinkey lights and knobs to entertain the users.