A Greek default followed by Portugal?

Portuguese friends are telling me that although the Portuguese TU's have kept quite and not done much it is more than likely that if the German Democratic Republic of Greece 9not so democratic lately) defaults then the Portuguese people will take to the streets and demand the removal of the austerity measures imposed on them there. The same appears to be the case with Spain. If this was to happen then the Euro will be going down the toilet with major and catastrophic affects on the rest of the world economy. Not looking good!