I think that was the purpose of making the life giver unless his desire to consume worlds changed into a desire to create them. One hunger for another.
With Galactus they, for lack of better words, forced his evolution into the being he was originally intended to become--they essentially completed his metamorphosis.
That is undoubtedly a great feat, but is it enough to say with certainty that The Ultimates can 'fix' DC by preforming the tasks mentioned in the OP? Not imo.
Really? Look at the process by which they accomplished the task. Have you read it? First of all, just incapacitating a being like Galactus is unthinkable. Finding his "birth chamber?" Conceiving of the plan? Reed Richards would have blushed.
As I said: it was a great feat(of which they prepped for immensely.) Does it mean The Ultimates can just pop-into the DCU and purge it of 'true' Brainiac, for example? Not IMO.
Yes, they prepped for it. They would in this scenario prep to accomplish the feats. you really think that ridding the universe of Brainiac would prove a more difficult task than turning Galactus, a planet eater for millions of years and a fundamental force of the universe, to a life producing entity?
You didn't specify prep time in the OP. If that was your intent, you probably should have made it clearer.
Anyway, does forcing Galactus' evolution imply that The Ultimates can rid the DCU of True Brainiac? Definitely not, IMO. If you're curious why, read Convergence.
Directly, no, but it appears to be a vastly more difficult feat. Locate all traces of Brainiac, kill it vs. even coming up with the notion that Galactus has a potential evolutionary form, come up with the means to realize that form and execute the plan, all on a being the is magnitudes more powerful than your team. As far as prep time, that's YOUR bad. Common sense dictates they don't come to a foreign universe and somehow divinely solve universal problems and for you to assume otherwise is poor deductive reasoning. Obviously, they prepped for Galacutus and the purpose of the post was to explore the possibility of them accomplishing comparable feats.