If it were just a maintenance issue with the Omnimovers, one would they think they could just pull out the cabs, leave the track in place, raise the floor an inch or so to cover the track and open that area up as a walk through. That way, if they ever wanted the Omnimovers back, they could simply remove the raised floor, put the cabs back on the track and start it up again.
I too did the Divequest tour back when the seacabs were running. It was fun waving at the people in the cabs as they went by.