The internal use of military forces, beyond those contemplated in Posse Comitatus, are foreseeable.

From the Joint SF University.  Straight from the hallowed halls of tyranny.

The internal use of military forces, beyond those contemplated in Posse Comitatus, are foreseeable.

 
LINK to Thesis

The purpose of this monograph is to examine the elements precipitating this circumstance, provide SOF with a better understanding of changing domestic threats and operational capabilities of LEAs, and draw insights from the similarities and challenges imposed by transnational gangs and terrorists both domestically and abroad. The monograph will argue that SOF need new skills and training to assume the law-enforcement-like missions they are being assigned.

And here on page 81 is their reasoning for the whole paper.

The potential for dramatic changes in legal constraints. As indicated
earlier, Posse Comitatus may not be as restrictive as most officers believe.
Further, current laws regarding use of force may change, especially if the
public perceives an increase in risk to their personal safety.