"will foreigners keep buying USTs"
Of course they will.
Foreign countries want to do business with and sell their wears to the US.
AND so long as your neighbor wants to "keep up with the Jones" AND he has a dime's worth of equity or a nickels worth of credit to spend on that goal, then foreigners will be buying UST's.
2008 gave you a pretty clear picture of what happens to the trade balance when the US consumer stops spending cold turkey.
We collectively have a LOT more equity in our collective "reserve currency house" to peess away before we stop spending cold turkey again.
That equity will become apparent when the upcoming Nuclear QE bomb goes off.
foreigners will keep buying USTs until the US Taxpayer is tapped out.
And with an annual GDP of some $18T and $20T of direct debt and over $100T in assumed liabilities going forward 20 years that time may or may not be close at hand.
Corporate America's "K" street will insure that foreign investors are repaid before the REALLY big creditors get theirs...Social Security and Medicare.