I think we should keep spins as long as we don't have a formal process to accept new products.
Something like => proposal => crop (aka product-to-be) => validation => product
When we'll have that, drop the whole spin thing, any spin that isn't fit to be a product should be reclassified as remix.
btw, it wouldn't be wise to define that process while we're still in Fedora.Next early stages, it'll just had more entropy.
First we should work to release our sample products, then use that experience to define the process to bring a new product.