[quote=Dead Cruiser]
Perhaps as a note, Sorin wasn't chastising Ba'al, he was threatening him. Mostly to influence whatever wish he may or nay not recieve. Even with all of the power Ba'al could dream of, Sorin doesn't really care about him. The moment Ba'al gains the ability to Planeswalk, he's made Sorin's shitlist.
[/quote]

Well, Ba'al interpreted it as chastisement. That's just how things happen. Besides, conquering the entirety of the multiverse is too much of a hassle, especially compared to just a galaxy spanning empire. Closest he'd get is wishing to be an Ascended being more powerful than both the Ancients and the Ori, but I don't think we've settled on whether the Ancients can Planeswalk at all (if they care enough to do so)