Al Sadr is not at all a "very powerful" man. Compared to the many other clerics, he's a small fringe figure. There will be an arrest, and it will be resisted by his supporters. These will be wounded or killed, but this will not inflict "hundreds to thousands" of casualties.
You really shouldn't blow this situation out of proportion. Most Iraqis still appear to dislike these extremists (especially those in Fallujah), and most wouldn't shed a tear for them.
But still, this is a very tense situation, where one false move could trigger even more hatred, now amongst the "normal Iraqi's". If handled correctly, it will (unfortunately) result in a small number of deaths, but then the "revolt" will stop, when these people realize there's nothing to gain and a lot to lose.
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