This indicates that at least one faction of the Army is backing the mullahs and Ahwannajihad.
The fact we have not seen Army units in the streets, as well as the notable and noticeable absence of the regular uniformed police for use in the crackdown suggests that faction may well be in a minority at the time, and other units are indeed restricted to base/barracks.
This is indicative of a classic power struggle.
We don't - can't - know what's going on behind the scenes, but the very fact that the “protests” continue unabated, albeit in lower numbers, leads one to believe these people know something is up, and they won't quit until such time as the fuse is finally lit for certain.
No, this thing isn't over yet - not by a long shot!
CA....
bttt
If you use the Russian Revolution as a template, this was 1905. It took another 12 years before the Tsar was deposed.