I'm possibly overreacting but that feels like grounds for impeachment.
If, in fact, she suggested that other documents besides our Constitution would be relevant, I have no quibble. Certainly, Egypt should look at lots of sources.
If what she said was that the U.S. Constitution itself is no longer relevant, she should step down. Her job as one of the nine Supremes is to interpret the U.S. Constitution as it applies to modern (as well as timeless) issues. If she finds the document no longer relevant, she is ipso facto unqualified for that job.
You can find the story here on The Daily Caller website. Hat tip to Lucianne.com for the link.