Warning signs are flashing red. Bond markets are projecting a 98% chance of default on Greece's debt. Stock pr...ices for French banks, heavily invested in that debt, have plunged 10% in recent days. Has the European debt crisis hit the breaking point, with Greece -- and perhaps others -- soon to exit the eurozone? Or, will officials once more cobble together new agreements that keep Greece in the club and prevent a huge contagion effect likely to cripple an already slowing global economy? Wharton finance professors Franklin Allen and Bulent Gultekin offer their insight.