Good question!

I was thinking these types of services should ask the individual share owners to vote, then tally the votes and cast the vote as "Yes" if more than 50% of the owners said yes (or maybe by percentage share of the masternode itself).

Eventually, as Dash grows masternodes could be owned by hundrends of people, then each vote would represent the average opinion of that group of people. Wisdom of The Crowd on steroids