They are free to trial things, and we are providing the feedback. There's only a problem with trialling things if they dont listen to feedback.
Plus this idea sounds like its such a bad fit that they may as well trial painting Nemesis pink, putting VR on The Blade, getting Durex to sponsor Oblivion, etc
It was fine in the past because it was maintained properly in the past. If you remove or don't maintain the lighting that was designed to guide people on cue then they're not going to realise an entrance has opened up, and they don't understand that they're supposed to move forward.
If there is a group that still refuses to budge, use a pre-recorded announcement to tell them to move forward. It's really basic operational show stuff, there's not been some kind of cultural shift that means people no longer move through dark rides. It's the same story with all of Merlin's dark rides, bad maintenance.
Hex on the whole has seen better days, and people no longer respond to it as well as they used to. It needs a proper refurbishment to get it back to its original standard.
The lighting was bodged a fair bit in the TLC redo (people woudlnt have noticed specific changes, but you probably noticed it isn't as dramatic anymore, with lights going up and down at random.. meh). The cinema video needs a technical update too, find an inventive solution to keep the video but make the room more interesting ie Wickerman's preshow.
Easy! But it won't happen sadly.