Think this is an optimal situation, would be better shown as a 3x3 config on an A320/737, where the passenger is sitting within a few inches of the two adjoining seatmates for hours on end.
Imho it is useless for the industry to claim that it is perfectly adequate already, they are a global business and need to meet globally acceptable standards. The obvious way forward is to help specify those global standards.
That is actually a serious issue well deserving of the industry's time, because there is reasonable evidence that the virus can spread airborne well over 20 feet, passing through the normal AC filtration.