I still run low level dungeons. I know quite a few others do too. As long as there is still level roulette you're not going to have to worry about not having dungeon help. You'll have to worry about not completing older raids without putting together a specific party, but glamor is pretty good incentive. Unless you're on a jam pack server the world may always feel a little empty (I'm on a lower pop world but I still manage to run into folks in any given zone I'm in and usually it's someone who's gathering, chasing down a hunt, and very rarely looking for the perfect picture spot). The only person who will make you use a jump potion is you. While I'm not entirely pro potion myself I can see why they're getting implemented.