I love Blackstar - the characters are really cool.
Mattel SHOULD do a Blackstar line - but do it later, when they can just use all existing parts from different lines (DCUC, MOTUC, etc.). That way it would cost them virtually nothing, they could put it on mattycollector.com, and those who want them can buy them (I would buy ALL of them).
The problem is more Filmation. Doesn't Filmation own Blackstar characters??
It was a Filmation toon. See Mattel should just spring for a cheaper ALL-Encompassing license to do all Filmation characters. The adult collector world knows what Filmation is - they could do all sorts of characters...