For the approximately 14 people who might actually do what you suggest, wonderful. For the rest of us, wrong.
It's funny, we heard the same thing about Thunderbolt 2. And 1. And Firewire . . . How have those turned out?
The 2016 is the best expression yet of how bankrupt Apple is when it comes to ideas for the MBP. They have ONE worn-out idea - make it thinner. I don't want it thinner, I want it better.
The existing rMBP chassis is already anorexic; Apple is one short step away from starving it to death. It has converted the 15" into a glorified Macbook Air.
The difference with Thunderbolt 3 ports is that it really doesn't matter a damn if anyone supports them. It'll be great when they do S they're ridiculously fast. But as they are also USB-C they are compatible with the industry standard connection format.
It's all very well wanting USB-A, heck I wouldn't have complained either. But kitting out a system designed to last users for a good many years with the technology that will be commonplace during that time. Rather than concentrating on the format that's about to be replaced makes sense. Wouldn't we all be bitching and moaning in two years time that our MacBooks were incompatible with the new peripherals being released if Apple hadn't made the change.
I for one am absolutely delighted with what Apple have done for the new MacBook. I weighed my pros and cons and tried all sorts of possible alternatives for months before making the informed decision to spend an obscene amount of money on a new MacBook and I don't regret that decision at all.