As people with black Sweetlings leave or die, then the dragon will disappear. It wasn't meant to be a release. It was meant to be the Spriter's alt and was graciously given up as an apology. I don't feel that should ever be released again because of the conditions surrounding it.
As far as not being about to get offspring directly from original vampires, I don't see why that should be an issue. Vamps are in no short supply and I seriously doubt they ever will be. Since they aren't capable of being worked into standard lineages, I don't see a reason for their re-release.
I would like to see old breeds re-released to the tune of one or two a year along side the new release and have the breeds swap out over time. That way everyone would get a chance at what they missed and CB's will remain in the population. However, I don't see a reason to raise the 2 CB limits.