They'll come back when people realize they're superior to lcd
I really wish you were right but I've got very little hope. I can only find a single manufacturer of crts anywhere in the world right now and they aren't consumer grade. These tubes are slowly dying (damage, leaking caps, trace rot, etc.) And when they're gone, fear the technology will be gone forever. They cost way more to produce and get to market than any kind of flat screens do and I'm doubtful that they would be able to pull off even 4k with the way the screen projects.
If anything, best case scenario, a startup begins producing a bunch of BVMs, PVMs, and CRTs for an incredibly niche market of rich retro gamers and supplements by building real classic-style arcade machines. They likely be charging in the thousands for a base model. Who would lend such an enormous principal with such a niche demand and zero supply of raw materials? I just don't see it happening and that's heart-breaking.
It reminds me of flash a bit. A now defunct format that had irreplicable advantages that people will attempt to emulate and preserve but which can never be experienced fully outside of its intended format. There's a good use for G4: quit failing, pack up the cameras, and dedicate all resources to reviving the crt industry.