It will all depend on the Ghods day rally.
If they (the regime) can suppress people's presence on that day with minimum casualties -by bringing busloads of their supporters, heavy presence of bassij and instilling an atmospher of absolute fear - then they will be convinced that the worst for them is over - at least temporarily - and they are in charge. From then on the regime can have the confidence to bring out its people, and they will likely move quickly against Karoubi and Mousavi.
If otherwise the situation gets out of their control on Ghods day, it could become a totally different story.
The Ghods day rally will be the break point that will determine the short term course of events.
If they (the regime) can suppress people's presence on that day with minimum casualties -by bringing busloads of their supporters, heavy presence of bassij and instilling an atmospher of absolute fear - then they will be convinced that the worst for them is over - at least temporarily - and they are in charge. From then on the regime can have the confidence to bring out its people, and they will likely move quickly against Karoubi and Mousavi.
If otherwise the situation gets out of their control on Ghods day, it could become a totally different story.
The Ghods day rally will be the break point that will determine the short term course of events.
Personally, from the military presence they have and their brutal crimes against detained protesters, I doubt it that many ppl show up again.
But I have no doubt that when they arrest Karoubi-Mousavi, ppl's resistence will get stronger and fearless. much much stronger with anger replacing fear.