“...But, they cannot be citizens, they cannot vote, they cannot receive welfare or tax perks. Most would leave.”
You know, or should know, it would never work out that way.
It's a no win, lose-lose situation for Trump. Q: Why did Washington abandon NYC for the duration of the Revolution? Sometimes, you have to make decisions with respect to strategic defeat. DACA is one such beast. It doesn't help complaining - O laid a turd bomb, and only a fool would deny that it was very effective.
Sometimes credit has to be given to the enemy when due. DACA was one such initiative. It has terrible, horrible optics. It doesn't matter if the kids are 30 somethings. The media complex owns the distribution. They can award a (fake) photo framing some starving waif with a Pulitzer, and discuss it 24/7 for the next year leading to Nov 18.
Thankfully, Trump gets it and won't be lured into the trap. There's so many other things on the MAGA agenda to move forward without getting your pecker caught in the zipper.
...but Trump should not have won either. Things are changing.