Duncan asked about the security implications of multiple persona We decided that this wasn't a good fit - that it would inspire debate rather than an answer.
I wonder what would happen if the question were rewritten to request input into a risk assessment on persona's. I'm not sure that Duncan expressed it well, but I think that the underlying topic is interesting; this is the kind of thing that makes my professional life interesting. But it would have to be revised to a risk assessment rather than a discussion.
The counterargument is that risk assessments are intrinsically discursive; I can credit that argument. Risk folks do love to talk and argue, and risk assessments don't always converge to a simple answer.