Looks like some individuals have had nearly the same thoughts as I have on the state of keyboards. The progress looks good.
Key64 has some good prototype hardware. The keyboard is short on keys and compensates by having layers bound to modifier keys, which appear mostly on the thumbs! Recall that I wanted to make the thumbs work harder in my post on the configurable keybord.
Another fellow has taken inspiration from Key64 to create Ergodox. His site contains PCB and 3D printing files so I could theoretically create a keyboard myself.
Finally, KeMice has an indiegogo campaign to create a lightweight, portable split keyboard with the right side acting as the mouse. If only they’d gotten the layer feature via meta-keys, I’d be contributing.