I love this poem. If you can draw at all, I definitely reccommend trying your hand at illustrating this, because it could turn out to be quite powerful.
I like how you took so few lines to target a very definitive point. As a fellow poet I understand how one could feel so great and write so incredibly, only to be overlooked by others who take what we have and learn to do better.
It is most important that we all remember that not matter how old, forgotten, or uncoordinated the lyrics of a piece may be, no poetry is trash.
My only niggle is this line "for the next great artist"....I feel like it took something away from the overall delivery because we can surmise that you're talking about stepping stones for other artists here.
Otherwise, love it! Simple, concise thought that is quite powerful. And uplifting.