Melee already have plenty of incentive to be next to the boss. It's called melee range for a reason. I'd like to see a melee class that abandons positional GCDs and combos altogether, just to see what SE does to change it up. DRG and MNK are the only classes where it feels like it makes sense that there are positionals on the class. MNK is the fast positional class and DRG is the slow one. NIN and SAM both could survive without it.
That isn't to say I don't want to see a melee class without positional requirements, but put rear/flank bonuses in Cooldowns/buffs or make it distance based instead. You can do more than just dancing on the same corner.
Also the number of omnidirectional bosses makes me question why we have it at all still.