My prediction is one of these days a company (probably not an established brand) will come out with a mid-size truck about the size of a Ranger/Colorado but 7-8" wider, and has a real 4' between the wheel wells. It'll be roomier inside than the current 'mid-size' trucks ..and more efficient than full-sized trucks. (Rivian R1T-ish?). I guess such a truck would be about the size of an 80's/90's OBS Ford or GM truck. And it'll sell like hotcakes. The extablished brands will flail their arms and exclaim, "Why didn't we see that coming?!"
I know a lot of guys who think their full-size tk is more truck than they need, and would gladly downsize a bit. But the current so-called *mid-size* trucks are too cramped, don't get much better economy and not enough bed utility. We'll see.