Ok, let's break this down a bit. Let's simplify it. devices grown on non polar GaN can reduce the polarizing electric fields that suck efficiency out of our LEDs at higher currents. Basically, for the same amount of material, you can get more electricity to turn into light. That means more light is coming from the same area. That means the surface brightness is increased. That means that this LED has the potential to make some awesome flashlights IF they package it in such a way as to not increase the apparent size of the emitting area.
If they only make arrays with this technology, then yes, we won't be able to use those as efficiently. But why would you put top-of-the-line LEDs into an array when the ones we have now are perfectly fine? The whole idea of an array is to keep from overdriving a single die, but instead to moderately drive a bunch of dice. The harder you drive today's LEDs, the worse their efficiency gets.
It really boils down to what package will they put this new LED in, and whether or not the wavelength conversion is remote or directly applied to the die.