Does the bell toll for Cameron?

Europe has come back to haunt the Conservatives.  Will he be next on the list of Conservative PMs, Heath, Thatcher and Major whose periods of office were defined by Europe?  We shall know soon enough.

http://www.telegraph.co.uk/comment/telegraph-view/8940736/Britain-needs-clarity-from-Cameron-and-resolve.html

http://blogs.telegraph.co.uk/news/peteroborne/100122393/david-cameron-support-of-the-euro-is-honourable-yet-it-could-ruin-him/

How will Cameron's Coalition partners react?  I expect this promise will be quietly ignored.