So why would it be any different this time? Why would Hercules have any say in whether or not he was bound to the river of death for eternity or not? Hades wasn't given a choice of whether he wanted to honor his to deal return Hercules's strength upon Meg getting hurt it happened automatically and there was nothing Hades could do about it.

Deals made with gods are clearly magic and it's not up to the individuals involved whether they want to honor it it just happens. If he tried to welch on the deal he'd just be magically sucked into the underworld or something of that nature and would be physically unable to exit the river of death. Once he took Meg's soul back to her body, he would have no choice but to return to the underworld and spend eternity in the river of death. God or not, immortal or not, Hercules is irrevocably bound by that deal. The plothole: Even if he survived the river, Hercules would still be bound to stay there for eternity. But, it turns out, being willing to sacrifice his life for Meg's has made Hercules a true hero and restored his godhood, so he makes it out of the river alive, returns Meg's soul to her body, and they live happily ever after. Hades agrees, saying 'You get her out, she goes, you stay.' Hercules then dives into the river to retrieve Meg's soul, and Hades reveals that the river will actually kill Hercules before he can reach Meg. So towards the end of the movie, Hercules makes a deal with Hades, that he will take Meg's place in the river of death trading his soul for hers.

Spoilers for a movie that came out in 1997.

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