The short version is: "Wouldn't it be disruptive if Apple went back to replaceable batteries?" but the author stopped short of where that leads.
One of the things that doable "now" that wasn't doable "then" is wireless charging. I love that I can put my phone on a pad next to the bed at night and it charges, pick it up and there is no trailing wire to unplug, put it down and there is no wire to find and plug in. This is a big improvement in my user experience.
Another of the things that have moved us forward is that power efficiency has gone up dramatically, as a result a smaller battery can give the same "run time" as a large battery of old without the bulk associated with the larger energy storage capacity.
Why not combine them?
Why not no battery in the device? Seal it against the elements. Then put in a pocket where a battery that is a wireless "charger" can drop into a slot on the device and provide the power. Current demands on a modern device are low enough that you just go wireless all the time for main power. Now your device takes a sealed "toaster pastry" sized unit that looks innocuous, but slide it into the slot and poof the device powers up, put it on a recharging mat and it starts charging up itself.
Now you have no exposed terminals to "short out", no worries about the battery in your device becoming a "pillow of doom"[1]. And you can carry a couple of extras if you're going to be away from power for a while.
You get all the benefits of replaceable batteries and none of the downsides with the possible exception of a "slot" in your device that looks funny when there isn't a battery in it.
I totally should have patented this :-)
[1] Just Google it :-)