I want to say it was around 2009 that the CRTs were swapped out.
I get it, CRTs are not made anymore, but there were solutions all along. They could mock up a fake curved CRT glass screen with a tiny projector behind it. They could at least purchase LCD monitors that shut off the backlight when receiving no signal or a pure black signal (I have an LG LCD TV that does exactly this as long as the settings are correct). Today, OLED monitors are pretty cheap (especially for a mega corporation) and would accurately replicate a CRT. Especially if they added in a CRT scanline effect to the pre-show video.
It's very frustrating how, unlike something like the yeti or the Rise cannons, 90% of Tower of Terror's show quality issues for the last 15 years have just been comparatively cheap A/V fixes and tweaks that they just have not cared to bother with for a very long time. Whoever is in charge of the show quality at Tower of Terror for all of this time should be fired. Recent fixes to long time issues suggest that maybe someone new is in charge.