When should a director listen to his/her audience?

A few of my thoughts on the shifting of scenes on stage, from today's Independent. Design a show so the audience can see it, please; improve it if they can't; know when something is daft and needs ditching; but don't pull a show because of pressure groups!

http://www.independent.co.uk/arts-entertainment/classical/features/tristan-and-isolde-should-an-opera-production-be-changed-if-audiences-dislike-it-9926635.html