When you consider any network today regardless of the technology utilized, they all had an MVE at some stage. If you consider a blockchain, or distributed or shared ledgers then there is Bitcoin, Ripple (cross border money movement), B3i (insurers and re-insurers), and several others underway e.g. energy trading, digital rights management. Given you need multiple parties to come together this can take many years. Additionally, various regulators in each industry are also beginning to voice their opinions across jurisdictions. This adds another level of complexity and reduces time to market.