Imagine how many more they would sell if they bothered to upgrade them every year, like every other computer company on the planet with much smaller bank accounts.
Quad-core Mac minis with user-upgradable RAM slots, not thin-laptop-design-in-a-desktop-case.
Really updated MacBook Airs. Not three-generations-ago processors and TN displays. But keep the currents ports and keyboard. Or if they drop magsafe, replace it with USB-C but keep the other two USB-A ports as well.
A Mac Pro that is actually made for pros. Function before form.