Almost certainly very serious. In the Indian tribe fraud case in which two Hunter Biden associates were convicted (Devon Archer's conviction was very recently reinstated on appeal), a lot of evidence regarding these key Biden Inc. players was gathered. One is now cooperating from prison. Next question: What will Devon Archer do? Obviously what they have to offer to the government, their bargaining chips, all have to do with Biden Inc. And the Biden Inc. case is open. Ongoing. But they've had to wait for the hoped for cooperation, working the documentary trail of evidence while they wait.
There's another indicator, and it's a significant one.
@FBI SSA and Public Corruption A/Unit Chief (former)
writes something that makes total sense: