This is false. It solves nothing. If you disagree please detail a specific example instead of vaguely claiming it solves lots of problems.
> For them to use a DB solution requires both parties to the transaction to be customers of JP Morgan
JP controls the network, so they must already have a prearranged agreement with JP in order for any of this to be possible anyway, at that point, the blockchain doesn't give you anything that couldn't be done faster and cheaper with public/private keys and digital signatures.