All Jews By The End

As a small part of a discussion with Tom Usher on Real Liberal Christian, I quoted the verse about being grafted into Israel - all the covenants are made with Israel and we become 'children of Abraham' and heir to the promises of the covenant as well. Tom disagreed that we are to become part of Israel, many others take that to mean spiritually because we're not necessarily physical descendants and because scripture tells us that's not the sole criterion.

BUT

Isn't it likely after all the "Jewish" persecutions and dispersions, scattering, emigrations and immigrations, that we all by the last days will have Jewish blood in our line somewhere?