Rowan Williams simply never proposed anything they accused him of.
He did not propose that Sharia law should take precedence over British Law. Or that Islam be incorporated into British Law. The closest he seems to have got is
"Muslims could choose to have marital disputes or financial matters dealt with in a Sharia court."The hysteria has had naturally the effect of demonising Islam even further. Which may be good for selling papers, but is a very bad idea for Britain. Much worse than anything which Williams was proposing, in fact.
A system of settling disputes out of court within a year - and without paying exorbitant lawyers fees? What next? Interest free loans? Now that would cause mass apoplexy in the editing suites of Docklands.