I'm a bit skeptical of that.
Yes, HRTFs are difficult to do correctly when every human head has a unique HRTF, but I have my doubts that a cheap headset with cheap drivers (like most gaming headsets) and a specially-tailored HRTF is going to win out over an audiophile headphone with quality drivers and a generic HRTF.
Also, several headsets such as the Logitech G35 and G930 just use Dolby Headphone, not even a proprietary binaural HRTF tech. This does raise the question of whether it's better to design the headphone around the HRTF, or the other way around...but if that were the case, people wouldn't be dumping their Tritton AX720s and Astro A40s (which you think would be designed around Dolby Headphone), keeping the decoder boxes/Mixamps that do the DH processing, and using better headphones. In other words, Mad Lust Envy's thread simply wouldn't exist.
Ideally, the HRTF itself needs to be fully adjustable across different sets of headphones and human heads. Currently, the only one that I know of that is flawless in this regard is Smyth's SVS (as featured in their Realiser), and that's because it takes recordings from earbud microphones in the user's ears while playing test tones through all the speakers in a typical 7.1 theater system, then calibrating the response from the user's headphones of choice compared to what the earbuds in their ears actually hear.