With respect to Eurobonds, investors should understand that what is really being proposed is a system where all European countries share the collective credit risk of European member countries, allowing each country to issue debt on that collective credit standing, but leaving the more fiscally responsible ones - Germany and a handful of other European states - actually obligated to make good on the debt.
This is like 9 broke guys walking up to Warren Buffett and proposing that they all get together so each of them can issue "Warrenbonds." About 90% of the group would agree on the wisdom of that idea, and Warren would be criticized as a "holdout" to the success of the plan. You'd have 9 guys issuing press releases on their "general agreement" about the concept, and in his weaker moments, Buffett might even offer to "study" the proposal. But Buffett would never agree unless he could impose spending austerity and nearly complete authority over the budgets of those 9 guys. None of them would be willing to give up that much sovereignty, so the idea would never get off the ground. Without major steps toward fiscal union involving a substantial loss of national sovereignty, the same is true for Eurobonds.