No with this change it just means melee dps will probably have slightly faster queue times as its now 4 vs 6. The 4 melee vs 6 ranged.

The DF for each dungeon tries to pair a melee and a ranged dps together. The formula is still there however if the duty finder cannot find a melee/ranged combination it will grab the next melee or ranged dps in the queue to fill the slot.