It also goes the other way. Do you think a "real" 2.6" charger (say with a 98 or 100mm exducer) is really going to be competitive with 3" modded chargers with 102 or 105 or 108mm wheels counterbored into the covers? How's that make it cheaper for anyone? I'll wager that all the guys in the top 10 will have custom chargers.
If that seems like small potatoes, think of it this way: (from Garrett's website)
GT4094: 2.67" factory inducer, max flow @ PR = 3 is 80lbs/min.
GT4202: 2.94" factory inducer, max flow @ PR = 3 is 94 lbs/min (+17%)
Of course the counterbore or "bushing in place" will take some off of that. But you still wind up with say 10% more air. It's significant.
This will make it much easier to tech, for sure. But I don't see this as lowering the cost for any competitor who wants to run up front.
Time will tell.