They just need to fix the low-level duty roulette to hit more instances. It's ridiculous that 4 people L35+ are put into a L16 instance. Duty roulette filling priority should be based around the dungeons that people have specifically queued for. If there are no more queues for a specific dungeons have been and there is a tank/2dps/heal group left over, group those four into the highest level dungeon available for the lowest level player in the group. I really hope to see this come 2.2.

Party finder is another option, but it doesn't give the bonuses that the duty roulette provides, making it a non-attractive option. Make duty roulette work across all instances, and this problem will work itself out more.