If you printed 50 new blank ledgers, they wouldn't have value because they don't have the history and our mutual agreement.
Bitcoin is the worldwide ledger (WWL).
POS coins on the other hand, are a different animal. If you own a POS coin, you get paid transaction fees for helping verify transactions. Thus, POS coins make fundamental sense, can be valued accordingly and create a reason to actually own the coin - and should, therefore, prove a better store of value than POW coins. Of course, POS is somewhat theoretical, but if Ethereum can pull it off, it should supersede bitcoin. Now, ELI5 why I am wrong, please.
http://www.truthcoin.info/blog/pow-cheapest/
Definitely not ELI5 material though.
Bitcoin is perhaps the most commonly stolen store of value the world has ever seen. It has its advantages, but being difficult to steal (or lose permanently!) is not one of them.