As someone who never uses the leveling roulette, adding this option would actually make it more likely for me to do so.

Already there are awkward work arounds people attempt to get into a leveling roulette with their friends. Adding the option to queue as a party seems like a far more positive thing than a negative one.

Yeah, you probably will see people doing it in groups of four, but you'll also see pairs and trios joining as well.

Don't exclude people because they want to play with their friends. It is the wrong mentality to have.