VR will be huge in future, when graphics cards can push much higher resolutions (need higher FoV and DPI) at 144Hz and above (and FPS), and the HMDs match that. For now, it's a novel if expensive gimmick.
For pinball it makes zero sense, and DeepRoot would be exceedingly foolish to pursue it. Apart from HMDs, they'd need the GPUs to feed it. Way too expensive.
Holographic stuff like Pinball2000, why not? Although hopefully it would be selectively used, or wouldn't cover the whole rear of the playfield, as with Pin2k. Transparent LCDs covering or replacing the pf glass would increase costs hugely, be very prone to damage & failure, and have poor light transmission.
Small ones at the rear of the playfield, mounted vertically like in CV could definitely work, and I'm sure it'd be the stuff of JPop's wet dreams ... but why do it when from what Mueller has indicated so far, price and volume are going to be so important to them. It'd be costly, and I could foresee supply issues. Plus it limits what you can do towards the rear of the play area.