If they don't fork, everyone affected by this will lose all of their ETH. Many would argue the correct thing to do is to not fork and say that people knew the

If they don't fork, everyone affected by this will lose all of their ETH. Many would argue the correct thing to do is to not fork and say that people knew the risks beforehand, etc. But that's what people said last time and they still forked, with no (apparent) severe consequences other than complaining about integrity. Two forks may be harder to justify.