I agree that the high cost of paint and bodywork is going to keep the 'patina' look in style for a while yet.
In my opinion, there is a difference tho' to a patina'd look and simply really bad, missing or rusty paint...and its best not to confuse the two.
If I had a truck that was solid and with what appeared to be a nice residual, patina paint....I would clear coat it for the time being to at least make it look bright, again tho'...that's me.
Also remember, patina is one thing.....rusted out is something else, lol.
All good
Coley