2300AD is its' own universe. Originally it had it's own ruleset (the Overlord system), but now uses the Mongoose Traveller rules. If there was an Expanse licence, it would be a separate universe using the Traveller rules.
Chaosium offers their core system (Basic Roleplaying, BRP) as a completely separate product line now.
What people are asking for in some ways is this. It wouldn't be traveller though, but Traveller would effectively be the flagship of a D6 core system in the same ways that Call of Cthulhu is for Chaosium. Certain elements like "sanity" are exclusive to CoC in the same way that a lot of the sci fi elements are for Traveller.
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