https://dashpay.atlassian.net/wiki/pages/viewpage.action?pageId=1867885
Where it says "Pooling" you can use the service to share a Masternode with others, receiving proportional ROI. It is my estimation that in the future Evolution DApps will be used to split voting rights among Masternode shareholders, too.
Decentralised MN pooling would be great to see but imo it still needs some time before it appears.
Remember that we have great developers who know how to make dash magic so we can see some kind of the trustless solution.