I don't know how many, but I think they will sell more. For someone considering a $6,000 flagship AVR (you did it once right??), he/she is not going to be turned away by $200 (if that, more likely just $150) from going from a New japan Radio (currently used by D+M) volume control IC to a flagship Cirrus Logic volume IC and from the ES9018K2M to ES9038Pro (yes the price jump on this one is over $100 but may be less for D+M).
It would be a huge psychological boost for the high end/audiophile oriented groups who would pay more for ownership pride regardless of audibility. I have been paying for the 4 wheel, or all wheel drive features that I never needed or used, and you have been paying a lot more for the Lexus vs Toyota thing too iirc.
Same for the upper middle models, but for those, the cost increase would be just incremental. For example, Yamaha has been using better DAC, volume, and opamp chips for years. They didn't even measure better, but they had the bragging right, even partially contributed to the myth that ESS Sabre DCA chips means better, than Onkyo, Denon, Marantz's that use the AKM, TI chips, when in fact ESS DAC has been making chips that are inferior to AKM and TI's, depending of which models are used.
All D+M has to do is to update their marketing material if and when they upgrade those chips, the professional reviewers, youtubers and many forum regulars will do the rest to spread and create the new hype.