There's a bit of an odd remedy issue with this lawsuit. The harm being asserted by the FTC is that Amazon charges more fees than competitors but requires that sellers not charge more on Amazon than on competing sites. Originally Amazon allegedly accomplished this with a Most Favored Nation clause, and today Amazon will kick you out of the "buy box" promotional space if they detect you offering lower prices elsewhere.
First, a breakup doesn't cure this harm. You could go all the way to the extreme of splitting Amazon's third-party marketplace into its own company and yet that company could still charge higher fees than competitors and condition the buy box space on sellers not offering lower prices elsewhere.
Second, no injunction makes sense either. Is a court going to force Amazon to advertise a price in the buy box that Amazon knows is not the lowest price available on the market? That's an absurdly anti-consumer thing for a court to order (and so a court would likely not order it).
So what cures the alleged harm?