And why Yellen would be forced to taper? I don't see any reason.

Leaving Eurozone has huge costs. Not sure Ireland can afford them. As for public banks, probably too late. Government could outright nationalize bailed out banks (like in Sweden), clean them up and sell. Sure it would cost less than bailout did. Or run them through prepackaged bankruptcy (like GM and Chrysler in US). Wipe out shareholders, replace management, clean up unsecured debt for cents on the Euro and guarantee everything else. Public banks? Bad idea, mixing politics and business.