The Democrats are trying to assess whether or not, or convince, their media counterparts to boycott all the hearings. The problem is that the material and the evidence is pure dynamite. And the outcomes will be significant.
The minimum outcome of this investigation is that Hillary Clinton will not be the Dem nominee.
The sky’s the limit for the maximum outcome.
A corollary to the Dems decision not to serve on the committee is for the administration not to cooperate with the committee.
I anticipate they will refuse to respond to any and all subpoenas the committee might issue. In which case, there will no evidence that is "pure dynamite".
Instead, there will be a Constitutional impasse...and more months of delay while the courts try to sort it out. At the end of which, the likely administration response to the court's orders will be "Try and make us".