Successor State + Carthage 'What If?' Question

[icydawgfish]

I'm going to slim this down as it appears to have expanded beyond my intentions.

1. By the start date, was there any possibility of either the Ptolemies, the Maks, or the Seleucids gaining the thrones of the other two and reforming Alexander's empire. If so, what would they key points have been.

2. Could Carthage have won the first Punic War, and if so, how would this have affected Rome's fate and Carthage's expansionist policy.