Introducing a whole new structure for modules would be a huge self-defeat for their reason for existing. I didn't get a framework laptop with the expectation they'd obsolete it in a couple years.
They could make an adapter that allows the current, smaller modules to fit in these supposed future voids. If done right, this adapter could be completely passive (no circuits).
I mean if you want a wider thing with multiple ports you can just get a usbc thing that does that and plug it into the usbc module? There's lots of those out there.
The Ethernet one sticks out a little but a multiple usb-a port one would be a lot bigger and put more mechanical stress on the whole thing.