Well, it is possible someone else manages to get the title but i figure the Wolves are the most likely candidate.
First, there's a tendency for "good guys" (we'll use the term loosely here) to win. The Wolves are, even with their modern Crusader-tendencies, the good guy Clan (The Ghost Bears are a tad too passive and off the focus, they're a good guy Clan but not the lead one).
Second, the Wolf Clan has been the leading Clan since the beginning... i figure that it would be right for Kerensky's chosen to finally do what they set to do so long ago.
Third, the historical allusion. Alaric Wolf/Ward/Steiner-(Davion)<-->Alaric I the Visigoth.
Fourth, there has been an event where Alaric Wolf duels Devlin Stone, and this event is depicted... or at least was depicted in IlClan cover. Presumably this means the Wolves land on Terra.
But all this is not a guarantee. And we don't know HOW they will manage it. While nominally the conqueror's of Earth are the IlClan, there is implicit requirement for managing to keep what they take. In theory, Wolves could be posited for IlClan-ship... only to lose it all to someone else. Taking Earth won't be easy, no matter what.
And we don't know what else happens in rest of the Inner Sphere. And what follows after. I expect there will be surprises, even if Wolves become the IlClan.