Wouldn't rates increase on the announcement? And wouldn't it still be better to finance the long term debt with longer maturities than 10 years? Long rates are [relatively] low right now, even with the premium to be expected from any reopening the of 30 year.
Of course, to expect politicians to think that long term might be too much.
One wonders if the biggest long bond rally in recent history resulted from the halt in 30 year bond sales...what will result from the Treasury resuming said sales....and if Goldman will front-run it again?