I know this post is old, but it is possible to get out of exclusive contracts.
I recently got some songs assigned back to me. I explained that my music had been with the library for a few years and I had not generated any income. The library understood and drafted a letter to terminate the contract.
Not all companies will do this, but it is definitely worth asking about. Most libraries understand how tough the business is. If they are not getting any action from holding on to songs, it does not hurt libraries to assign the rights back to the composer.