Unless the attorney can prove fraud on your behalf, I doubt very seriously if he can automatically cancel of irrevocable power of atatorney that you hold. This, in my opinion, would be a matter for the Court to decide and not the attorney. His client obviously made you his irrevocable power of attorney for a good reason. Check out irrevocable.
The attorneys were fired because they were not "loyal Bushies" according to the e-mails released by the White House and Justice Department. The difference between Clinton's firing of all of the attorneys and this set of firings is that these 8 attorneys were fired mid-term. Not that this isn't allowed. Thsy can be fired any time. One problem, however, is that GOnzales didn't just tell the truth and say "we were trying to find people more loyal to Bush". Instead he lied and said he didn't have any conversations about it when in fact he had an entire meeting, etc.
Now none of this is illegal, still, but it is sleazy, and clearly he is lying to AMerica. Since America now knows that the person in charge of making people obey the law is a liar, does that damage his ability to lead the justice department? THat's for you to decide, but here is my opinion:
1) the fact that he is a liar is bad
2) the fact that he condones domestic spying is worse
3) the fact that he condones torture is worst of all