The only way for this to happen is exactly the way Sun did it. Powered up a shit ton of Steem, controlled the super-majority of the witnesses and implemented changes to the code. It didn't matter if the power down period was 1 week or 5 years. A simple change to the code was enough to control everything. Which is what we should focus on...

And yeah 13 weeks to have access to your entire stash is just too much time in crypto.