What Europe needs is a show of solidarity, and the Eurozone even more so. A bickering giant on its shores is not helpful.
I presume you are referring to Germany here? The UK, USA and the rest of the World are pretty clear what Germany needs to do.
Which may be a long time coming
In other words, the time to sell bunds will be when Germany finally realises the game is up and reluctantly props up the Eurozone, probably via the printing presses of the ECB.
Unfortunately, that won’t happen until Eurozone has a near death experience with countries threatening to leave the currency union and customers lining up outside banks demanding their money back.