Yeah there were some westerns in the '80s but "'80s Westerns" weren't a thing in the sense that '70s Westerns were. 1976 seems like the last year where the genre was still current in any sense. That was the year of The Outlaw Josey Wales and John Wayne's swan song The Shootist.
I like Eastwood's Bronco Billy, from 1980, but it's a movie about a contemporary Wild West show. It's Western themed in an obvious sense but it's not a real Western.
I guess Thee Amigos is decent, but again that only kind of counts. And it's nowhere near as some of the later movies in a similar vein like Galaxy Quest and Tropic Thunder.