The “MacBook Air” was introduced in 2008, redesigned in 2010 and has pretty much been Apple‘s most popular computer ever since.
Almost a decade and a half of being their most popular computer.
On the other hand, the “MacBook” was Apple’s cheapest, most low end plasticcomputer for two years, given an aluminum shell in 2008, renamed to “MacBook Pro” in 2009, made plastic again later in 2009… and totally replaced by the MacBook Air less than two years later.
Then it was brought back four years after that at a much higher price point, existed for a couple years, and… Was replaced by the MacBook Air 2018/2020-M1 again.
The name does not describe a long running very successful product.
Instead, it describes a product that has been discontinued and totally replaced with a MacBook Air… Twice.
Say whatever you want about the “MacBook Air” name, that it’s not actually the lightest and thinnest MacBook to ever exist, that is totally irrelevant, that it doesn’t make much sense in the product lineup…
but the name represents success.
It’s successful, it’s recognizable, it’s iconic, it’s part of the public consciousness, and it’s existed for 15 years.
So no, it doesn’t make sense to change it.
It’s almost like changing the name “iPhone” or “iPad”, sure maybe 10 years ago they could’ve gotten away with it but… It’s way too late now.