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ETH doesn't scale as well as Graphene so why would you choose it for billions of transactions and possible microtransactions? ETH probably will not ever be a global computer as that is wishful thinking and naive optimism in my opinion.

Graphene can scale due to it's design to handle millions of transactions. So if ETH can be made to scale like that then why not but even in that case ETH doesn't have the ability to import legal documents or interpret law. Maybe it could be possible in the future.

LKIF and similar ontologies can allow for actual law to be imported to the blockchain and understood by autonomous agents. Tauchain is the only platform promising to do this.

References

  1. http://www.estrellaproject.org/lkif-core/
  2. http://ceur-ws.org/Vol-321/paper2.pdf
  3. http://www.estrellaproject.org/?page_id=3