I would very much like to see Gruber's take on it. Because while Marco is a prominent software developer, I dont think he understand Apple "that" much.
Take SD Card as Example.
To me they are going to the way of CD/DVD. I am not a professional photographer, so it is a little hard for me to understand what specific workflow that SD Card is mandatory.
We have 802.11ax and 802.11ay, First being a much improved 802.11ac that should finally mean WiFi doesn't suck ( as much ) and the latter brings 60Ghz direct line of sight transfer and 100s of Gbps. While we are unlikely to see those speed, it is no argument that we are capable of doing 5-10 Gbps wireless transfer now, and even better in the future. So why the need for an SD Card? Your Camera should wirelessly connect to your Computer.
Then there is the Keyboard, I loved the Magic Keyboard. But even then it is not perfect. So not only should Apple NOT try to put scissors back to MBP, they should make something that is better then Magic Keyboard, give the sense of depth, using more or less the height of Butterfly, while being super reliable. The problem with only 5% of MBP have keyboard issues is that the previous MBP had 1%, that is 5X more! They should aim high and have a failure rate of less then 0.5%.
Again it is the same with trackpad. Let as avoid all the discussion of why such a large trackpad. But if they are going to make it stay there, may be an hands on keyboard sensor, we want palm rejection to be 99.999% accurate! Not 98 or 99%.
The list goes on. But Apple is known to be the master of iteration. Or more like Steve Jobs's Apple was known for it. So the next MBP is going to be critical.
Mac is still a 25M unit/ year business. 5th Largest PC Vendor by Unit, likely higher on revenue, possibly the number 1 in profits since Apple make 10x more profits then other PC vendor. ( Doesn't mean Apple is making a lot, it is just other PC vendor are cut throat competition going down to 5% Gross Profit ) So Mac still matters, and will continue to matter for the coming 10 years, despite the Post PC era, and going in a full circle, It is Apple's best chance to take over some PC Market.