Let's face it: Apple has determined that desktop computing is yesterday's market. They see 10%of revenue as expendable instead of expandable.
The monitors are now gone, the Pro will probably follow (3 years without update??), the mini is probably going to have one more redesign into an aTV-type box without everything soldered down, and then it will just be the iMac and the MacBook Pro in 2 years.
The top iMac is an OK Pro machine, for some Pro uses, so they will make it their top-tier soon.
I was thinking in the past weeks about how nice the Apple ecosystem was when they made printers and monitors and everything you needed to have a desktop. The printer market is now such a shambolic scheme that they could clean up by entering it. Apple should be expanding! They have unusual amounts of employees, revenue, floorspace, etc., but they have less and less product, and they always work on weird, distant, unwanted projects that never go quite right and never make any real impact... corporate parasites are now eating from the Apple, no doubt.
It wouldn't be unexpected to see Macs disappear by 2020. They make money from Phones, and they dream of vaporware cars.