I've wondered about the future of 19" monitors for games, given the CRT becoming obsolete. It seems that between old G07, 4600, and 4900s with burn, and 19" tubes from old TVs, we should be good to go. If that's not easy for someone, there's using a TV tube, and buying an 8-liners type chassis.
In 10+ yrs of collecting, I've never bought a new monitor, but it will be a shame not having the option. Even so, it's a lot less of a problem than not being able to find actual parts/artwork to restore a game.