I don’t know if #4 is possible: you would have to be able to change your password/PIN and from the explanations of how self encryption works that doesn’t seem to be possible. So that needs checking. Also, if it isn’t possible, that makes password security vital, so in practice I hope you are able to change password/PIN.
#5 is possible but involves a lot of work (investment - in development and storage), and produces an inferior product (storage with latency due to layering), which means that investment is harder to recoup - it has to be done on price, yet it can’t be cashed in quickly because it will take time to sell it all, which in turn adds marketing costs. This is not an honest business model, but an attempt to cache in on a freak event (storage cost spike) that is against the proven and most likely tend, and might simply not happen. I think this is a very poor scam, so I can’t imagine it being attempted by anyone with significant resources. Surely speculating in the price of Safecoin is far more attractive based on #3.
I think the low chance of #3 makes this a very risky and therefore unattractive proposition. I think #5 is impractical even if 3# happens. Even if #4 is possible, I still think people with these skills and resources can make money in much less risky, less investment intensive ways.
I judge that attacks of this sort are likely to be limited because of this, and so not a real concern for the network. The risk is therefore not serious: the risk is that the price of storage might be ever so slightly inflated because a tiny proportion of the network storage was subject to speculative hoarding.