I think -under CAFE pressure- it already has been. Rolling resistance & aerodynamics are basically at the 98th percentile. Pedestrian cars have triple door seals and laminated side glass. Don't expect noticeable improvements going forward.
^ Engine noise as an irritant or annoyance is also likely true for 1% of drivers. I'd go so far to say that a far greater percentage of drivers find their engine noise enjoyable, rather than annoying. The vast majority, tho, are indifferent. Engine noise is not driving anyone to switch to an EV- that's a fallacy.
Check out your own ride, at around 20 MPH and above (barring a performance car/exhaust), all you hear inside or out at cruising speed is wind & tire noise. I've been outside on my lawn on my 25 MPH street and looked up to see a Tesla going by- sounds exactly like any other type of motive powered vehicle. It's no coincidence that the feds are working on instituting artificial EV noise at speeds UNDER about 19 MPH.