Every LCD monitor on the market suffers light leakage. It's due to the backlight (either fluorescent or LED) always being switched on so you never get true black levels. You can try this by placing a monitor in a dark room and setting it to a plain black screen. You will see the black has a glow to it.
The only alternative to CRT's for black levels are OLED screens where each pixel emits its own light. When a pixel is black (off) it really is black, but they're extremely expensive and the only ones available are large TV's in the 50"-65" range.
There's always going to be this discussion of LCD or original and maybe OLED will offer a better solution in the future when the price comes down, but i'm all about keeping games running and in peoples homes. I believe there are plenty of great LCD LED backlit screen available nowadays with very good black levels that work lovely in pinball 2000 and i've brought games to shows over the last few years to back up this and allow people to play them and see what they think. I don't think you can say 'The LCD (and even LED) screens are not suitable for Pin2K games' or 'They ruin the Pepper's Ghost illusion.'
In my view CRT's are never going to be remade and should be properly serviced and rebuilt if being used in the home. I've seen what happens when a flyback fails on a high voltage CRT.