Oh I completely agree with you, but if United States v. Microsoft Corporation (2001) is any indicator, this is precisely the solution the Courts will prescribe.
I would argue that the guiding precedent is more likely to be the PeopleSoft case where the DoJ lost because they tried to define the market too narrowly. At the time of the Microsoft case, they had 90% of the market. Apple has under 50% domestically and under 25% world wide.