Nothing in the world can take the place of Persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education alone will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent.
I would keep your concept, but Elton's suggestion to set it aside for a while and move onto something new rings true. A few years down the road, you can return to it with fresh eyes.
To be honest, an identical one-sentence story idea doesn't mean all that much...it's the execution of said concept that makes it a good read, and no two creative teams will execute an idea the same way. Just look how many superhero books sound the same on paper, or zombie books, etc. Just make sure your werewolf western is original when/if you get back to it. (I would, however, change the title.)
To quote Orson Scott Card, write today's best story today and tomorrow's best story tomorrow. In other words, don't hang onto something forever, constantly trying to perfect it. Write it, get it out there and start the next one. If you write and complete four stories in a year, you'll grow more as a writer han fi you spend that entire year trying to perfect that first one.
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