I *might* be ok if the new HHG effect is somewhere between the old and the new. If the screens were set back at the same depth as the current figures, and they did not do the silly cartoonish guest interactions, that might look ok.
Though one issue with the MK projections is sightlines and angles. With physical figures, the reflections always lined up to the viewer not just in your car but for the cars on either side of you too. So if you're in a group and looking in the mirror at the reflection of adjacent friends, you saw what they saw in a realistic 3D manner.
But however they implemented the projected effects in MK, once you get off-center the effects no longer seem to line up properly. I'm not sure if that's a result of the angles of a flat 2D effect in a 3D world, or if it's because of how they implemented the effect (isn't it Musion/reflected image?)
If they can work out the viewing angle issue *and* tone down the cartooishness, I might be ok.
Did DL ever get the upgraded "moving" sound system in the stretching rooms? That was a solid upgrade in MK's Mansion.
-Rob