They will figure out a way for sure, they will also get the most help they could get from all around the world, from exchanges, from swaps, from any place that could track the money and could get it back to them.
I do not think that it would be simple, it is going to take some time but since the money cannot be cashed out that easily and the price hasn't crashed because of it too much, then we can say that it didn't happen as badly as people feared it could have. Now, imagine a world where people stole 615 million dollars and actually cashed them out and turned that into money in their bank accounts? That would have been the real terrible result for sure.
Some of those stolen coins were deposited on some centralized exchanges and already frozen. Others are still in control of hackers. Axie Infinity probably don't lose all of those coins. Big centralized exchanges will support Axie and refund when case is closed after investigation. Because it is good for reputation of their exchanges and it is good for the crypto market too. In addition, if they support Axie, in the end, they will have some rewards from Axie. I am sure about that.
In history, there are some stolen coins and hackers hide many years, then they deposit to exchanges and get caught. It can happen for rest of stolen coins in this hack too. For those coins, we can assume Axie might lose it or might have to wait for years and luck to get it back. Anyway, the coins are currently frozen on CEX is good enough and it is a support for Axie investors. Price has yet collapsed 2 weeks after that hack.