Obviously Destiny 2 will be on current Gen only, which will improve Vault space, in the years to come with next Gen systems, we will probably get even more Vault space. Sooner than later Destiny year 1-2 will have to abandon last Gen, and improve Vault space. Hell if I still have Vanilla Destiny weapons and armor all the way till now, I show in the hell will have these guns and armor years from now!