I have no problem with a change in tactics but I have big problems with a change in any strategic goals which leaves Iraq to Iran and the deadenders.
For instance we can put some symmetry back into warfare and kill Sadr and his 'crew'.
But I'm interested in just what strategic changes you'd like to see.
You at this juncture would have to defy the Iraqi government to do that, and the government would dissolve, and/or maybe order the US out. "Sadr and his crew" are part of the governing coaltion, de facto at least, and maybe de jure. I think that would be the match to really ignite the civil war. Just my guess.