Will we see more of this violence? Most assuredly. Further, as this economic failure matures, damaging ever greater numbers of people, we may see less violence against people and more economic violence (disruption) in an attempt to extract from society as great a cost as they possibly can. A couple of hundred people, using the super-empowerment afforded by network disruption, could easily cause countless billions in economic damage. A thousand people?
Terrorism from abroad isn’t an existential threat to the US. Domestic terrorism, as a result of systemic failure, can be in a super-empowered age.