Implementing the Legacy bank SHOULD have the credit sharing as well. Especially now that this Legacy bank will be mostly used for Crafting, credits is also very important in that matter, as companions needs to be sent to work, and collect resources. This needs money, and other characters with different crafting.
If we remember at the launching of the game. They wanted us to create more characters to explore not only the stories, but also other crafting experience. Adding credit sharing will just increase the happiness of so many.