I Was just thinking. Even though it probably won't happen, and only one of my Oda Predictions have every come true(BB's stealing DF Theory) I think this might be one way for Luffy to get out.
Oda has shown that the war is real, people are dying. Moria was making Zombies in the beginning, Ace was killed, as was Whitebeard, But would Oda kill off hundreds of pirates in this war?
The reason Squad stabbed Whitebeard was because apparently, Roger killed his entire crew. I don't know about anyone else, but at first this took me by surprise, Luffy's always been noted to be like Roger, by people like Crocus, Kureha, and Kokoro, And I couldn't imagine Luffy killing an entire crew of pirates, but Then I thought that if they came close to killing one of his crewmates, or put them in a critical state, Roger or Luffy might lose it.
Then, Akainu used the exact same situation, except on a larger scale as a lie to fool him(Squad). Akainu said Whitebeard made a deal with Marine HQ to have his allies cornered, and killed, in return for Ace's safety and the rest of the Whitebeard Pirates. This was obviously a lie, and it was perfect for Squad because Whitebeard trusted him enough to lead the entire allies, and when he was being lied to, he gave leadership to the Decalvan Brothers.
Now, This was two times in a row Oda hinted at Crew Genocide. Now, What if all of the crews, or just the Whitebeard crew, or everyone or some, or whatever. What if entire crews were killed in this war along with Whitebeard and Ace?
Some might now agree, as it would be a tragedy indeed, and that it was Whitebeards final order for them to go to the New World and live on, but is that enough? Oda has already proven he can kill people off when some didn't expect it because of how something would go to waste, like how People thought Ace wouldn't die because it would have been Luffy going up and down through hell itself and being thrown like an ant in a storm in a war.
Oda has shown that he can have Luffy do so much, and lose a decade of his life, for someone, and then it be in vain. Now, what if the same thing happened? Whitebeard died on the battle field so his crew could escape. Yes, he gave this order, before Blackbeard showed up and planned to just hold off the Marines, and most likely kill Akainu, He didn't get to hold off the marines while his family escaped because of Teach.
So now, every ship is frozen. Akainu has shown great durabily, and got up from one of Newgates attacks, and vowed to not let the son of Dragon escape Marineford alive, and I don't think Iva's attack knocked him out. Right now, the only ship that has a chance of moving is Whitey's, and I don't know if it was already frozen, as it might need to be already moving to break through the ice. Also, keep in mind that Akainu was able to melt all of the ice in the bay.
So, I'm thinking that we might see Whitey ship to start breaking through ice, and Marco orders Jimbei and Luffy to leave on it as Luffy is the one that everyone wants to survive now, or Jimbei and Luffy will simply being standing near Marco not knowing how to escape, When Akainu attacks again. Akainu will attack and either, melt the ice where they are standing, or destroy Whitey's ship, depending on which case happens.
Now there will in both cases be portions where there are no ice, Either from Akainu's attack, of from where the ice was broken from Whitey ship before it was destroyed. Both cases have water escapes, where Jimbei could take Luffy and escape, While the Marines and Warlords fight the Allied Pirates, and The Blackbeard crew.