"Regarding worship and 'relevant worship' (the eternal quest of Prayer Book Changers) let me simply say that when we try to use worship to 'reach' people, we have turned the object of worship from God to the people we are trying to reach."
Deacon Phil Snyder (Dallas, TX) on fb
I think that changes have to come, but always with the Reformation goal of putting the worship in the language (includes musical style and other issues) of the people... not to make them the focus, but so that they can fully participate. To help them become part of "common prayer," not just an audience.
But as Deacon Phil says, the decisive question is "Who we are aiming to please, God or 'the customers?'"