No, I wouldn't say
all of Abraham's physical descendents
will be rejected, for example Paul, Peter, John etc and all
Jewish people that believe in Christ for their salvation.
hmm, there's a couple verses...
Ro 11:
5 Even so then at this present time also there is
a remnant according to the election of grace.
23 And they also, if
they abide not still in unbelief,
shall be graffed in: for God is able to graff them in again.
(the unbelief in 23 is, IMO, unbelief in Christ for their salvation)...
But the houtws of vs.26 '
in this way' means to me that while the Gentiles are being grafted in there is also a trickle (hopefully
surges) of Jewish people that are also grafted in, and that this grafting in of Jews and Gentiles is
the way that God restores all Israel which occurs 'until the fullness of the Gentiles be come in'.
Once the olive tree is completely filled with elect Jews and Gentiles, ie, 'all Israel' (the graftees no longer Jew/Gentile) then it seems that end-times events would start to kick in. I don't see a big national conversion including eg, Shas ultra-orthodox haredi Jews (who, oh my, very don't like Christianity, yikes) near end-times. I'm not saying that it's impossible for God to do so, he could open the eyes and hearts of even hardened haredim to see and accept Christ Jesus and graft them into the olive tree. Hope I made sense...