You can already play classically, start a new character and follow the old road to Lv75 without doing newer content for EXP bonuses, trusts and whatnot, just don't uncap your level, you could unlock trust just because you wont find enough willing party members to continue the extremely slow classic EXP way to Lv75. And when you get there, then what?


All they need to do is add new content in some shape or form to keep the game going.