The problem is they're so deeply limited by what they can actually do in that show building. That's why they were pitching to go the VR way because it's something you could attach to the seats and then once a headset is on, you don't realize the limitations anymore since you're sort of transported to whatever is in front of your eyeballs.
The problem with VR in a theme park though and why it hasn't happened yet is because not only of having to help every get the headset on (which slows down load enough as seen with Mario Kart (and that's an AR device which is easier to put on), but with VR, everyone has a different IPD (Interpupillary distance) and the only headset up until this point that actually measures your IPD inside of the headset is the just released PSVR2. The reason this is important is if the IPD settings are wrong, the image will look blurry.
That headset is also super easy to put on, so we're moving in the right direction in terms of the potential for them park usage if someone wants to someday, but when the WIR attraction was pitched in whatever year it was (2017 maybe?), we weren't anywhere close yet. However, with VR so readily accessible at home now (and fairly cheap, too) if people want it, there would have to be a really unique attraction idea for VR to warrant being worth it in a ride setting. Especially since it would be a nightmare from the ops side of things with capacity likely being low.
I do think that, at least if we're going to keep the Speedway, turning that into a Sugar Rush themed attraction that runs on electric cars would be way better than it currently is and it would make the transition from FL to TL a bit more seamless.