I think now is the opportune moment for Dooku to be plotting against Sidious. He has ridiculous amounts of freedom, and he is already sitting atop a huge power base. Why does the Republic HAVE to win? That benefits nobody but Sidious and Dooku is left trusting that Sidious will allow power to trickle down to him. That would make Sidious Emperor, it would give Sidious the strongest standing army, left unopposed after the shut down of the droid army. Also it would involve Dooku voluntarily sacrificing the immense power he has been given over a huge chunk of the galaxy to go sit in a jail cell... The CIS isn't much different than the Republic. If Dooku killed off Sidious now, left the Republic in disarray, and forced the Republic to capitulate then he can have the exact same outcome. He could declare himself Emperor, and turn the CIS dominated galaxy into whatever kind of galaxy he wants. The man has been given immense authority under an ideology that urges him to exploit any opportunity and think of himself first and foremost. For him to be committed to Palpatine's goals at his own expense is just... dumb for a Sith. You take this character that is very charismatic and one would think very intelligent after spending the vast majority of his life as a Jedi, but then he turns out to be an idiot and lacks even the most basic understanding of what the Dark Side is about, when it took Anakin about 5 seconds to figure it out that he can ultimately overthrow Palpatine and turn the galaxy into whatever he wants. I'm keeping my fingers crossed that they retcon the convoluted explanation of the novelization that Anakin was going to become some general and Dooku was just going to take one for the team and get arrested. Say what you will about TCW's representation of Dooku, but that in itself made Dooku a complete idiot IMO. It would seem more plausible to me if Dooku sincerely makes an attempt to usurp power. To really throw a twist in, then make it so that in ROTS Dooku legitimately captures Palpatine and it is not part of some plan Palpatine orchestrated, but rather Dooku using Palpatine as bait to lure Anakin so that Dooku can turn him and then kill Palpatine, only for Anakin to save Palpatine. Especially now when they've already established that Dooku HAS plotted against Sidious and therefore has treated Palpatine as expendable to any larger plans, I don't see the necessity of turning Dooku back into a pawn that has worked out his differences with Sidious. There is apparently a huge drop in Sith quality. Plagueis wants to be partners with Sidious and he suffers the consequences of trusting those who are selfish. But then Sidious turns around and feeds that exact same lie to Dooku and he eats it up? Not a very compelling character to be played so easily, IMO. As far as Sith go, he would be the worst of them on screen, and as far as basic intelligence goes, one might expect him to be smarter.