From this Macworld article by Michael Simon:

Over the past decade the Mac has comprised an increasingly smaller portion of Apple’s bottom line, and it’s hard to not see last week’s Hello Again event as the beginning of the pro Mac’s retirement party. It won’t happen overnight, but the day when Apple is only selling a single Mac desktop and notebook line is within sight.

And:

If anything, the Touch Bar probably has more mass appeal than any prior MacBook Pro feature.

The article is an interesting read, but these two quotes stood out.

First, there’s the quote about Apple winnowing the Mac line to a single desktop and notebook. I wouldn’t go that far, but I would be a fan of a simpler product line, along the lines of Steve Jobs’ famous 2 x 2 matrix: A pro and entry level MacBook, and a pro and entry level desktop.

Then add in a configurable, upgradeable Mac Pro, a machine that can take max RAM, multiple drives, swappable motherboards as new CPUs/GPUs/etc become available, with an emphasis on power and a cabinet that is easy to open, with lots of ports. [Note to Apple: We know this machine will be expensive, so be sure to give it a long lifespan – That’s what the upgradeability is for.]

The second quote points out the huge appeal of the MacBook Pro Touch Bar. I totally agree.

My 2 cents: This is no gimmick. I see the Touch Bar being the common currency that crosses the chasm between macOS and iOS, the camel’s nose in the tent, as it were. Once developers adopt the Touch Bar and users start to see the awesome things they can do with it, I suspect that Touch Bar will be standard on every Mac.

And, eventually, that path will lead to a hybrid product, a full touch-screen Mac that can run iOS apps. Sound like the Surface? Perhaps. But that’s a road I see. And I think the universal Mac will prove easier to maintain and make it easier to shift workflows between computer and tablet, easier to build and maintain apps that run in both worlds.