There is a reason this service is not, nor will it ever be disruptive--it does not address the core underpinnings of the notary system: verification of documents and identities. Online identify verification using inaccurate third party verification databases is not sufficient to prove identity for any purposes. Holding up a document or id card to a webcam does not allow for sufficient examination by the notary of the document or card showed to prove that the document or id card is what it is alleged to be.
Indeed, this system would actually aggravate the notarization scam problem it claims to address.
Going digital does not solve every problem. Most people at HN may not realize this, but there are a lot of situations where things cannot be done through a computer.