Either you've forgotten or have never read about the one olive tree spoken about in Romans or any other references to Jews and Gentiles in the New Testament. If you have a concordance (you can use it online for free, of course), you could look them up for it's way too much Scripture to post here.
By the way, I believe what you're looking for in the future already was fulfilled long ago. It happened "soon," just as Christ said it would, to the generation He was speaking to ("this generation"). One thing I am certain of -- Dispensational futurism is not biblical at all.
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