I think you have a very poor understanding of why foreigners (to US and UK) invest such large quantities of money at these absurdly low yields.
Let me ask you this: why do you think there's a huge foreign demand for US/UK/EU bonds at these absurd levels?
I don't think there is going to be that is the problem. I think the US and UK economy are going to tank soon. If they haven't started already.
Let me clarify: why do you think there has been (say, this year and last) such a huge demand to US/UK/EU bonds at these absurd yields?
And?? The REALLY big reason for steady foreign appetite over the last few years? The billions and billions that get stashed away at every auction?
Really? You've been inventing all those macro policy products and you have no idea why there's a huge demand for US government products steadily over the last few years? Hint: might it have something to do with vast trade surplus that certain countries have built up? Can you complete the remainder of this thought?
Your theory is not backed up by the facts. In the UK there was a bond strike. The US might be different but that will change.