I have a bad feeling that they'll be more capable even after the introduction of the new ones - if they remove SD Card slot and there will be only USB-C ports and audio jack, I'll have to purchase another backpack for all those damn adaptors.
Really? The adapters moaning isn't going to go away I guess. There are likely to be a crop of multi adapters for all the basics—mini docks and even combo adapters with AC adapters. Even now, I carry adapters because I have to connect to stuff that shouldn't have a native port these days.
Ethernet? Does the vast majority of the laptop-using world use these regularly anymore?
Firewire? Pretty niche these days.
VGA?
I could go on. I have a USB to serial adapter for messing getting to the console on routers and networking devices. I have to carry an adapter. Big whoop. I don't want a serial port on my laptop, "Pro" or not. Most of the world has moved on.
How often do you carry a laptop without a bag? You'd think the average adapter weighed more than the laptop for all the complaining about them. (The price isn't even bad if you don't use the Apple branded stuff.)
If they will have included one USB-A, it would be better for the transition.
The biggest problem, traditionally, with keeping compatible ports is that peripheral makers and such never move forward. If you can make a device that's USB A or USB C and the current crop of MacBooks support the former as well as the latter, "Nice, I don't need to manufacture anything else."
I've been hearing this kind of concern since floppies were roasted and Macs forced USB pretty hard. Pick your poison: sporting a serial and parallel ports and floppy connectors for like a decade too long or full steam forward. There is really not good way to "ease" into it because backwards compatible ports don't force industry change.
And if they remove SD Card, we'll lose way how to expand storage on-demand.
I wonder how many people are actually doing this. There are a lot of little features that become less convenient but Apple knows their actual demographics (and I guarantee the lurkers in this forum are anything but the vast majority).
My only concern is that there are four "identical" ports that aren't actually identical (e.g. some can be used for power, but not others, some are Thunderbolt 3 but not others). That seems relatively "un-Apple" and goes against the whole point of "one port to rule them all" but we'll see when they actually come out.