I do have a lot of fabric- will just admit it! That is why I am in the QB Fabric Moratorium 2015. But I do find that it can get "crazy" when I allow scraps to build up and take over horizontal spaces and overflow the scrap basket. I just finished two I Spy quilts and a sampler top so it is time to stop and cut scraps again. A Brick quilt is in the works as a leader/ender project, next go round once the scraps are all cut and put away. So to your question, when to rehome fabric? If you don't love it anymore, give it away to friend, guild. If you can cut it up and put it in a runner or quilt, do that. Google "ugly fabric quilt challenge" to see examples of these.