I've argued for this same thing before.

At least allow people to have up to 2 people in their party for leveling roulette. This still leaves 2 more people, and will give people an actual reason to do leveling roulettes with their friends.

"But Eidolon!" I hear people cry, "then a DPS will use a tank/Healer to get a faster que than a DPS without a tank/healer!"

Except the fact that the thought in that statement instantly defeats itself, because you're actually bringing a tank/healer into the que who might not otherwise have done the que without them.

I will not understand the people who are against such a system. I understand the concern if people are talking about doing a full premade party for leveling roulette - in which case, you are correct. If you have rested EXP, just do the current on-level dungoun. But it does not help those who want to play with their friends.