You are dreaming. That isn't going to happen at all.
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That would be more of a nightmare than a dream, but it is a very realistic potential outcome if the Supreme Court interprets “under the jurisdiction of “ in the manner consistent with original intent of the 14 th Amendment and consistent with prior rulings
So legally it’s potentially logical outcome but politically it would be pretty explosive.
However, a Supreme Court ruling on the 14th Amendment potentially would not be governed by the Constitutional prohibition against ex post facto laws and the current generation of anchor babies would not automatically have their birth right citizenship grandfathered in if the Supreme Court made the determination
With a legislative solution, anchor babies would probably have their citizenship grandfathered in
This is called leverage
Last time I checked, President Trump is very good a manufacturing and applying leverage
That is why it won't happen. It would be too disruptive. I think they would make some "Defacto Officer doctrine" to let the past aliens alone, and thereafter allow the executive branch to prohibit future birthright citizenship.