Well all the original shuttle routes were badged as class of service 'C' irrespective of fare paid or booking class, and this still appears on the boarding pass, it is just that the onboard service and crew staffing levels have dropped.
Back in the day Club did not have an empty middle seat either....
some B757s ( Belvoir Castle was one) were adapted for shuttle flights with an extra 20 seats or so compared to regular 757s - There was no problem serving 185 hot breakfasts or hot evening meals back in the day.....
A lot has changed since then of course but I do wonder about the potential loss of capacity.....