No, they'll need more than "The usual suspects, only harder"...
An effective deployment of blame propaganda needs to elicit a level of hatred and fear in the general population which is as frightening, and as capable of provoking violent anger, as a rational response to the real disaster and the real danger would be.
...And even more so, in 'street politics' among the foot soldiers of the regime: they will have a lot of work to do.