Why reform and not create new a new church?

On a the praxis podcast D.G. made a comment as to articulate his calling to reform the Methodist church he said something (and I will not quote just summarize what I get from it):

We serve a crucified Lord, whoever said this work would be easy? Why is it there are some young people who run up against a polity which may make things difficult they stop? If we love the UMC then we must be willing to fight change the polity and not run from it just because it is 'difficult'.