It's my belief that the DOJ was waiting for the 2 other branches of government to sign off on criminal charges before proceeding. Indicting and prosecuting a former president is unprecedented.That's where we'll either witness the referenced squeamishness of the DoJ where charging former presidents is concerned, and test the reality of some semblance of the long suspect (MIA) 'equal protection under the laws' (Is he 'too big to fail'?), or we'll see that once in a while the Oligarchs and their hand-puppets cut one of their own from the herd for slaughter..
The latter would at least instill some hope for the System.
I also don't believe we will see any movement until next year. The DOJ doesn't need Congress at this point to proceed and there's nothing The House could do to impede or stop a prosecution.