A nice idea but most airports just don't have the facilities to accommodate that. The better solution going forward would be to make any aircraft over 150 seats a twin aisle. It takes no time boarding a 767 compared to a large narrowbody. Especially with 40% of business travelers estimated to never return, it's asinine to be running 20+ 320's on ATL-LGA. That was once the domain of the 767 and it worked just fine at around 8x daily.