Let us lay this debate down. Instead of trying to deride the other guy, lets concentrate on making something so fucking awesome, that we will neither want AK or AR.
The ARK should combine all of the best qualities of both AR and AK. The accuracy, ergonomics, and interchangeability of an AR must blend flawlessly with the reliability, durability, ease of maintenance, and a dab of the cost effectiveness of the AK platform. The end product shouldn't cost more than $800 for a standard model and less would be great.
I think the piston AR uppers are a step in the right direction, but maybe not enough. I want to see a bit more toughness added. As for some of the other ARish rifles out there, I don't think $2,500 is anything near a reasonably price for a fighting rifle.