That's just it. It won't.
They're coming in over the border now that Obama stopped all border security. Once here they travel by auto.
The Real ID is for tracking and controlling Americans. Just like gun laws are for law abiding citizens.
The Constitution guarantees us right of free passage within our country and between the states (like that means anything anymore). Requiring papers to cross between states has been floated before at the federal level. Real ID is simply an early step on the road to doing that.
The federal government has no Constitutional authority to regulate our travel within the US. Between states or otherwise. The fact that it is going to these extremes without opposition is proof of the pathetic banana republic the US has become.
I still find no reason why having an ID that absolutely confirms who one is and where he is from is a bad thing.
We can all pooh-pooh the motives, but the end result is that if you are an illegal, you won’t be successful in getting a RealID, IMO. Obama’s reign will pass soon and then we can deal with the efficacy of a TSA and DHS hampering and limiting our internal freedom.