Until the new diners are up and running, there is no ADA issue at all. The current diners can't handle a standard wheelchair.In the summer of '13, they ran in the front, doors forward, making an ADA issue.
Even once the new diners are in use, who knows what will actually happen. During the very first run of 8400, the revamped Viewliner I diner, Sunnyside put the diner in backwards. They had the table side with the wheelchair table facing the coaches instead of the sleeper. When I pointed that out to Brian Gallagher he just rolled his eyes and told me how hard it had been to even get Sunnyside to start using the diner; much less orientate it properly within the consist.