And if Ptolemy IV is killed? There is no heir. In such a circumstance Antiochus would be very unlikely not to march on Alexandria. Having conquered Egypt, his Anabasis east could be more decisive for not having to worry about the Syrian fontier and Anatolia. Araces and Euthydemus could be more totally defeated and more elephants prised from the Indians. Hannibal is still in Italy and Roman interference is impossible, never mind the circumstances for it haven't arisen, when he can march west in 204 bc.
Pergamon would be toast. Invading Greece would likely make him hegemon of the Aetolian League a dozen years ahead of OTL and Philip V sucumb to overwhelming force. The League is a Roman ally and Hannibal has not yet fled to the Seleucid court. There could be half a dozen years of consolidation before a conflict with the Republic need arise.