I'm cool with them being left behind because I like the grind of finding and upgrading new weapons and armor. Would I like to have all year one exotics? Of course, but not having some of those weapons are not going to ruin the fun I'll have playing the new content. Plus we have no idea how good or bad the new exotics will be. There might be a gun or two that makes all the old exotics feel like pillows, we have no idea yet. I'm just happy with new content and the different way the game will be (new rng, level system, weapon balancing, new reputation, new bounties, and the ghosts being helpful and different looking).