During a recent FL to MA and back trip on I-95 I found CB comes to life during a traffic backup. There were a few times I heard "smokey bear" and debris in roadway reports that weren't posted on WAZE yet.
I still find it to be one of the best ways (for now) to communicate with motorists in your immediate area. Hopefully with GMRS license fee being lowered, 462.675 will take over as the unofficial road channel. GMRS FM radios are less noisy and a great improvement.
For all the bashing of AM and all the endless praise for FM, I've never heard much of a difference on two way radio. Sure, hi fidelity broadcast radio where they have all their equipment set up commercially. But as for the average Ham, I've never heard the "great" sound of FM. Because good sound is like a chain, and the weakest link determines the final quality, most people aren't set up to maximize the theoretical and actual potential of FM. I've heard a lot of HF SSB that sounds way better than anything on VHF/UHF. Even some really well setup CB AM is just as good as any FM analogue.
GMRS is potentially a good thing, more bandwith and different bands is another tool in the toolbox. But it is also potentially another problem as it could split an already diminished radio using public because some people won't adopt both. If you see some people stay on CB and some only use GMRS, it could be one of the worst things to hit the motoring public.
Since CB came first, because of its old and knowledgeable base, because of its heritage and how well it is known, and the fact it truly is license free, is the way I'm going for "less than Ham" radio service. I'm sure that those truckers who still use CB will continue, and especially those who are well invested and have overcome the power limitation by simply getting an (illegal) amplifier have no need for GMRS. Since CB and its channel 19 are so well known, I think it will weather GMRS just fine.
With a little bit of "extra" power, 11 meter can often beat 70 CM to death with a baseball bat, performance wise. Better radio horizon, and other HF advantages means you can do things with 11 meter you can't with 70 cm. Add in SSB and a good setup, GMRS can eventually become the vastly inferior performer simplex wise, with the repeaters being the only advantage for GMRS. The sheer amount of "import 10 meter" radios flying off the shelves is a sign that the 50 watts FM GMRS does not have a real life advantage over real CB users in the real world. In the end, the only real advantage GMRS has is the fact you can get more gain from a shorter antenna, and 11 meters means that the common compromise antennas hurt performance. The rest of GMRS's arguments are null.
In a major emergency, another issue could arise with GMRS, in the sense that there are very few channels. Repeater frequencies eat up more bandwith. And UHF is very crowded, with a lot of demand threatening it.... how many users does it take to fill the channels to overcrowded on GMRS? CB has 40 channels, plus (I don't support freebanding) 5 Alpha channels within the band, for 45 within CB itself, along with a long history of free banders who open up a lot of more bandwith potential if things do get REALLY bad. Right now the bands are dead, but if all these radio buying folks start squalking the at same time, GMRS could have the same problem 23 channel CB had in the old days during a crisis.
I think GMRS is a good thing. But when people start talking about replacing CB with GMRS they get on my bad side, in a very bad way. Radio bands complement each other, they don't replace each other. When Midland and others are attacking CB to promote GMRS they are doing a not good thing.
If you want my honest opinion, and I mean HONEST opinion. The ONLY reason GMRS has any popularity is the $20 Baofangs being used illegally on FRS and GMRS. That's it. GMRS is a bleed off for the idiots who buy them and use them without a license, and they could easily reason that sacrificing GMRS and FRS is a small price for chasing the "kids" out of the Ham bands.
CB will continue on because of illegal amplifiers overcoming CB's power problem. GMRS will thrive because of illegal use by $20 HT's.
Let's support all the services, and not try to run one off the road for another.