A lot of pessimism in this thread now! There is rightfully a lot of disappointment about Apple's current lineup, but there's a pretty clear path forward for the MBP.
I am optimistic about performance improvements in the redesign. AMD is on track to be able to provide Apple a part that can provide the same or more graphics performance in a smaller thermal envelope. There's still the question of whether Intel can do the same. I expect Apple wants a 35W hexacore package for the 15". Sunny cove cores should theoretically be able to do this if Intel can make them exist.
As some people have brought up, the killer app is probably bezel-less displays, using OLED if they can secure enough supply from LG. Like the 2012 retina, an OLED display would be something that sets Macbooks apart from laptops. Unlike Dell and Lenovo, Apple can guarantee a large enough order to make production worth LG's time.
I/O won't change. But it will be mostly sorted out by 2020. Your external drive already uses USB-C. Your PS5 controller will use USB-C. You'll connect to your TV wirelessly with your newer better iTV, and you'll connect to your friend's TV through their chromecast.
If there is a matter of serious concern it's the keyboard and touch bar. Apple knows they need to change course here. Let's just pray they don't try to "innovate" any more than they already have...