Using Proof of Stake will end up with Masternode stakeholders owning a lot of beach front property.
Edit: Proof of Stake will allow large Factoid holders to vote on the conversion rate. They will make it prohibitively expensive to buy entry credits. Wealthy attackers can create counterfeit entries and cause genuine entries to be ignored by consensus. In other words, Proof of Stake is not a good consensus, especially for property. Wealthy factoid holders will collude to attack record systems of valuable real estate. This has already been done in countries that have gone to computerized real estate bookkeeping. It would be better to not avoid Bitcoin's consensus approach. Proof of Work offers stronger protection from such attacks.