Faulty logic.
Democrats would take that up quickly, then as soon as they had the majority and the WH, they would repeal and replace.
The President has the right approach, carrot and stick.
Carrot is agreement to review DACA applications.
Stick is deny 99%+ applications, build wall, merit-based immigration.
For sure, mine was purely a hypothetical. In the real world, it would never pass Constitutional muster anyway.