2- O P2Pool CAN and SHOULD have more than 51% of the hashpower! That's it! If P2Pool owns, for example, 80%~100% of the hashpower, we will be much more safe!!!;
100% of the hashpower by single software solution is not a very good idea. Some bug or exploit can lead to a disaster.
Yes, it sounds good, but 100% is not healthy for ANY single entity.