I wonder if the 15 and USB-C might be a surprisingly big upgrade driver?
I'm not trying to say that will drive massive upgrades in and of itself, but I can definitely see it being a nice-to-have at the margins and help a nontrivial set of people pull the trigger.
I don't understand the need to have a single connector vs a block with interchangeable cords, but I also don't care that much about it so I might be missing something.
I mean my MBP has a MagSafe charging port, but I use USB-C for powering that too. One type of cable for everything.
“Why do I have to buy new cables? What about the stuff that uses the old cable still? I need two now?”
I agree it’s the other new feature, whatever they are, that would be primary drivers for most people.