Just chiming in to also express my wish to preserve the old arena in some way. If a toggle doesn't work, would making the arena transparent outside of battle be an option for g-posing or just generally admiring?
I completely understand that some players experienced motion sickness or vertigo while playing, so I agree that accessibility accommodations need to be made. I just wish there was an option for those of us who don't need the accommodation to appreciate the old arena.