The main difference between Thomas's opinion and the majority's seem to be that Thomas thinks the Obama administration didn't have authority to implement DACA,

The main difference between Thomas's opinion and the majority's seem to be that Thomas thinks the Obama administration didn't have authority to implement DACA, whereas the majority doesn't seem to want to rule on that, but doesn't believe that the government can just pull the rug out from underneath someone either way. Additionally I'm not sure if "DHS can terminate or renew deferred action at any time at the agency’s discretion" is as open ended as all Thomas seems to imply. Certainly that discretion itself has to be legal. ex. They couldn't just decide to deport people who don't donate to a political candidate. It has to follow some legal process. IMO it is a failure of the Legislative branch to deal with this.