Active Scaling for FATEs and Hunts instead of passive scaling or fixed difficulty?

[TechnoTechie]

I played WoW: Warlords of Draenor for a month before stopping, but one thing good about that game was that they made rare spawn mobs scale based on the hate list.
I don't know why square hasn't done this yet, but I feel it would solve the issues with FATE and hunt mob difficulty (or lack thereof).
In WoD, difficulty of the rare spawns increased while you fought it for every person that helped. This meant the mob would be pulled at regular HP, but as soon as someone else hit it, it would have 2x the base HP; When a third person hit it, it would have 3x base HP, etc.
Of course this should be used for A-rank and S-rank hunt mobs, but ALSO for FATEs. Active scaling for FATEs would mean you could solo a FATE after FATE-rush-hour or that large parties wouldn't obliterate it before everyone gets credit. Of course, it shouldn't apply to the boss-type FATEs like Cancer in Eastern La Noscea or Gorgimera in Northern Thanalan as those seemed to be meant for a large number of parties.

tl;dr version: can we please make FATEs and Hunts scale based on the number of people currently there instead of historical numbers?