The current cabins look INCREDIBLY sterile-from the white bulkheads to the cheap-plastic looking leather seat covers. I am hoping they replace leather with cloth on long haul flights.
Cheap, plastic-looking leather? I don't think so.
As for your suggestion that Delta switch to cloth seats, not gonna happen. Leather seats are a signature element of the Delta brand.
Leather seats are incredibly uncomfortable and rather cheap for long haul. No other legacy domestic or major international carrier has leather seats on long haul flights in Y except DL (and L-US AA A330s, which will be eventually be replaced by cloth seats.)
This entire cabin layout looks cheap and plastic looking:
RJ85, F70, E135, E140, E145, E70, E75, E90, CR2, CR7, CR9, 717, 732, 733, 734, 735, 73G, 738, 739, 744ER, 752, 753, 762, 772, 77E, 77W, 789, 319, 320, 321, 332, 333, 343, 359, 388