Normal conditions assumed, The A388 needs less than 2100m legal ldg field length, no problem there. On a 3.2 deg glide you will need flaps 3 instd of flaps 2 to avoid acceleration, with considerably added noise. And you will have to extend the ldg gear about 1000' higher, leading to even more noise. Overall, a stupid idea from people who seem to know little about a/c ops. No surprise there.