This. And they are only 1 or 2 supreme court justices away from the rubber stamp there as well.
Right now, the only real check has been long term bureaucrats. That worked in Trump's first 2 to 3 years, but has started to really falter in the last year or so as attrition has set in. Any executive order that Trump issued right now would likely be followed and would not be challenged in a reasonable time frame. This includes a potential Trump executive order authorizing immediate deportation for any past DACA recipients. Perhaps they would later have legal right to reenter the USA, but in the short term (which could still be years), they'd be deported to a country they don't even know.
Personally, while I support DACA, I think the bigger issue is with Trump's attempts to retroactively change laws and regulations. The intent of DACA was to bring people out of the shadows. Those who took the DACA "deal" should not be punished for doing so. While I would still disagree with it, I could respect new laws and regulations which disallow new DACA registrations while still honoring the deal made with past DACA recipients. I can't respect the bullshit Trump does. A deal is a deal. He is dishonorable in his dealings, and because of that, he has made America dishonorable. DACA is only one of 100s of ways he has made our nation completely untrustworthy.