Well, I don't see this "unknown" (Unknown characters, Unknown McGuffin in the A Plot) issue going away anytime soon. They just can't really do anything about it. At least, it feels that way.
I really liked the Base Expansions Story until the Dark Heart got damaged and realized they were just going to use the Dark Heart to circumvent the entire concept of The War Within by using fan favorite locations to get us to Midnight. It just felt a bit cheap.
Undermine(d)'s campaign was also pretty great even if again there is the issue of lack of context on some of the characters actions and happenstance.
I just worry that the A Plot will continue in this extremely slow fashion with no characterization and no real events taking place that can refuel the enthusiasm for the franchise.