If it were possible to transfer SP between accounts (as I mentioned in the OTC example), a stakeholder can reduce the risk of getting hacked by spreading his stake.
On the other hand, if "hack protection" is the only reason holding back the implementation of my proposal, then consider it's an even safer measurement to not put any funds in at all.
I am not saying this is the only downside, it's just the most obvious to me right now.
It is not a simple thing to assess the pros and cons of features that directly affect financial issues but also the usability issues of a social network. No matter how we look at it, if users don't have the 13 week lockout period, the security is lower.