It's not the industry, it's the FCC. The FCC hasn't allowed it, so it can't be legally used and radios that support it cannot be legally sold in the USA.
What should have happened in the 1980's is that FM should have been permitted. Many other countries allow FM on CB. That results in cleaner audio, the use of CTCSS/DCS squelches, etc. Since it's allowed in other countries, the radios exist. Problem is, since it's not allowed in the USA by the FCC, the radios cannot be granted a type acceptance to make them legal for sale.
But, yeah, eventually digital will happen, but I wouldn't hold your breath waiting for it. The FCC will need to get enough pressure from the public to make it happen. Most of all, someone is going to need to decide on a standard. The standard needs to be robust and cheap.
And that's the big issue Amateur Radio has, there are many digital modes in use on VHF and UHF, problem is none of them are compatible with the others. So, a bunch of digital radios, but they cannot all talk in digital mode. Manufacturers have taken to giving repeaters away to clubs to generate interest. That results in people buying a specific brand digital radio. That's great, but it creates digital "islands". Fine for the ham crowd. Most will claim their chosen mode is the best. As usual, ask 10 people and you'll get 11 different answers.
Digital CB, eventually. FM on CB, something you could push the FCC on now. The CB die-hards should really band together and start pushing the FCC on that.