They won't do this and it would also be a shitmove. Destiny2 maybe, but shutting down support midgame would be a real shitmove. And the other thing isn't even a big deal. To solve the problem the non-dlc'ers should also be able to reach level 40 (because it literally means nothing but access) and a maximum lightlevel of 280. So they're still able buy stuff from the vendors and are able to do nightfall, weekly, daily IF the mission/strike is a non-dlc one, just like before. Not hard to implement and it would hurt no one.