I expect the 13" will eventually move to a 14" similar to the 15 -> 16 change.

Yup, this is pretty much the reason I go with Lenovo Thinkpads. 14" fits nicely in all my bags and is big enough to see two things side by side.

So yeah, Apple is not even on my radar if they don't offer a 14" form factor. I also don't use other Apple products, so there's little reason for me to compromise.

FWIW I successfully did some work on a United 787 in cattle class (economy) with my 15" macbook pro in a middle seat. It was tight, but it helped that the guy in the window seat fell asleep leaning to the wall... But yeah, I might resurrect my old trusty 2011 macbook air for situations like this...

my thoughts exactly. seems theyre going the wrong way size-wise. rather have 14". drop the 15 AND the 13, imo. reduce skus, improve profit.