If digital credentials like these are to ever be useful it’s because they have an installed user base of the current K-20 system - which is as good of a bed-rock as bitcoin, in my opinion. Public schools may be in flux, but the K-20 system itself isn’t in danger of going away completely. If they’re maintaining a ‘private ledger’ it’s the benefits of a blockchain.
And in an essence, it could function as a transferring service between chains - allow ‘imports and exports’, using BlockCerts, from bitcoin to private ledgers that’ll inevitably exist.