There's no reason to pour all those updates into a machine with I/O that's going away.
I agree - in a few years time, everybody will be using 40Gbps Thunderbolt 3, 10Gbps USB3.1gen2, maybe even USB 3.2 and the Retina Macbook - with its single USB-C port that doesn't support anything better than a single 5Gbps 3.1gen1 channel (and
that not at the same time as a 4k@60Hz display) - will be completely left behind.
Oh, sorry, you
were talking about the
Air, not the
rMB? That's odd, because with two 5Gbps A-type USB 3 ports, the Air will support
two of any USB-C device that the rMB will ever be able to drive, the 20Gbps TB2 port supports 4x the bandwidth of anything the rMB has (and, while there's no guarantee, at least an adapter for 3.1g2 or 3.2 devices is a theoretical possibility).... and you only need to buy the necessary adapters in the future, as and when you get USB-C devices, not today when every single device you have (even stuff you've just bought) has USB-A.
Or maybe everything will have gone wireless - in fact, you better hope so, because the rMB can't run a 4k@60Hz display and 1GB ethernet at the same time.
Anyhow, if Apple did want to update the Air, they could go the iMac route and just swap the existing TB2/MiniDP port for a TB3/USB-C and leave the existing ports - just causing the relatively minor annoyance of forcing people to update their VGA dongles.
its not going to be too long before USB-A goes the way of the CD drive.
That's what they said when Firewire came out. I wouldn't bet my shirt on USB-C taking over beyond the one area where cramming everything into one plug really does have an advantage - phones and tablets. OTOH, phones and tablets are likely to be the first thing to go 100% wireless and eliminate
all connectors.
Even Apple is still selling systems with USB-A. Microsoft is actively shunning USB-C. Most PC laptops that
do have USB-C/TB3 squeeze in a few USB-As as well. I've bought expensive devices in the last 6 months that have USB-A (and no USB-C alternative). Every USB-C drive I've looked at has included a USB-C-to-A cable.
USB-A isn't going to go the way of the CD, its going to go the way of VGA: i.e. in 17 years time our cyborg cockroach overlords will still force their human slaves to carry their USB-A adapters just in case.
Worst case with an Air: in 3 years time, the donglegate boot is going to be on the other foot (except you'll have accumulated your adapter collection gradually over the years).
I'm not even sure the CD went the way of the CD - the iTunes store opened in 2003, Apple dropped CD/DVD distribution of MacOS in 2011, released MBPs with no optical drive in 2012
but also updated the classic MBP to the latest processor at the same time and finally dropped the 13" Classic in, what 2016? Last I looked, Apple were still selling Superdrives. That's 12 years from the writing going on the wall to not-quite-extinct.