There is a debate how one should take the conditional verses non-conditional
statements in
the DtrH. It seems to me that it ran like this. Originally, the eternal
house of David's dynasty
was unconditional. A conditional conception came with Josiah in which even
the dynasty was
conditioned upon obedience to Dtr law. Dtr1 went back to the unconditional
to inspire hope
for the exiles.
LMB
L.M. Barrre, Ph.D.
Assistant Professor of Hebrew Bible
Angelfire.com/ca2/AncientIsrael