Writers block is not a lack of ideas. Far from it. Writers block stems from disillusionment. One looks at all the story ideas, and rather than feeling excitement, one just asks himself, "What's the point?"
Writers face a great deal of rejection on a daily basis. And in those works they get published, there's often a wide variety of interpretations, supposing they are lucky enough to have an audience. After a while, the writer gets tired of no one getting the message behind the story that he's trying to convey, until he wonders why the hell he bothered with trying to put a message out there in the first place.
It stems from trying to entertain or educate an uncaring public, and the only solution is to write the kind of work that you would enjoy reading. Seek to entertain and educate yourself. If it should have more widespread interest, then so much the better.