I mean, what are the counterexamples?
-the body-on-frame/rwd/solid axle Aerostar/Safari/Expo were...slightly smaller than the domestic quarter ton vans. not really mini, plus all the drawbacks of high floor height, bad fuel economy, truck handling etc. of the full size vans.
...which is why they aren't sold anymore.
-the VW Type 2/Vanagon:
Customers didn't like rear-engine handling. Or two-digit hp in a 5000lb gvw vehicle. Plus it's hard to make forward control layouts pass front-impact tests. So, a design dead-end.
-Mid-engined Japan-vans
High floor height, weird service position, once again, crash safety became an issue.
Of course, I'm happy that all these vehicles existed, and surely many customers felt their advantages outweighed their deficiencies...but on the whole, the Chrysler model ended up defining the market as it exists today, in the same way the Mercedes W124 defined "luxury car".