I think post apocalyptic scenario is too much exaggerated. See, in any case the apocalypse won't happen suddenly or in blink of an eye. The change would be gradual and seriously it is happening right now but we are not seeing it anyway.

So we will have changes into blockchain as well. May be there won't be changing of codes but there will be upgraded system. May be a completely different blockchain based technology. This kind of revolution is always there when we need it or when it's outdated tech that we still using. May be it's time to sit back and enjoy the pie that we have.