CB is alive a well. It can serve a very useful purpose in vehicle to vehicle communications, making good use of a mere 4watts. And well I can convince someone to spend $60 on a CB and have decent comms with them in very short order vs convincing them to buy a book/take a class, study (this scares off most), spend $15 on a test, wait a week (assuming they pass on try one), then buy $300+ in equipment.
HAM is more capable, more reliable and more dynamic. It's a much smaller crowd, thats far more spread out across it's band area, and even then HAMs have many bands they spread beyond that.
FRS is up and hopping too, and licensed GMRS is even a fair bit more popular than anticipated too, which can provide an outlet for medium range private non secure conversation at a similar to lower cost than HAM, and FRS is an excellent outlet for immediate need for close range non licensed communications, pass out a few $20 radios and to start a search in the confines of a park, or just keep in contact with some kids going to the park down the street or talk directions to someone while they follow me during rush hour where separation may spread a few blocks it's highly effective.