The money markets are certainly not reacting as if Greece was to exit the EZ.
The Euro is in fact higher against the British pound, only just at 1.402, than before the Greek referendum when it stood at 1.416.
The Markets are generally a good indicator of economic events anywhere.
There is no doubt that a Greek exit from the EZ would have uncharted consequences for the rest of the EZ member nations as well as worldwide.
My belief is that a viable solution will be agreed upon and that Greece will not exit.