Pretty open ended question, and up for multiple opinions and debates.

    Just my $0.02:

    Regarding book keeping, really a decentralized open ledger provides the access for on-demand auditing (at least in the public network), thereby speeding up the process of checking the books and making sure everything lines up (assuming the network is not under a 51% attack rewriting history).

    Certainly blockchain ledgers combined with specialized AI models trained for accounting could potentially automate the entire accountant career. Although, I am sure that we will still need and have accountants, just there time will be spent in more important matters than balancing books, etc.