Also if POI is to be implemented it will be important IMO that there will be a account/alias bound reputation system.

But the major flaw that I see atm with POI is regarding the fact that you can just circulate coins between your own account and get hashing power that way. If this isn't prevented somehow I suggest that the forging will be at maximum 20% based on POI.

But these are all my speculations, I've got no legitimate knowledge on the mechanisms of POI. Lets just see that how the white paper turns out.