You can see it happening step by step. It's also part of the reason the Rats are fighting the wall. A real wall would reduce the inflow dramatically so even when we have a Rat POTUS who ignores the law it will be harder for the next wave to come. The Rats want a never ending inflow so they can replenish their ranks with a new batch of govt dependent voters.
This country has no will to deport the majority of people who are hear illegally. Our only hope is to stop the future inflow without a wall it won't happen. They can pass a whole bunch of laws, but if they aren't enforced what good are they?
However..... walls can
and will be breached. With yet another Rat POTUS that ignores the laws the wall breaches will not be repaired and it will be the equivalent of having "no wall" again anyway.... even after all those millions (or more) having been spent.
The problem right now is .... with Trump angsting over Dreamers like a damned liberal.... many on the right will probably refuse to vote for him 'again' in 2020. They will figure 'what's the point'? Might as well sit home and let the rats have it ....since....they seem to have the power right now anyway, since nothing is getting done towards conservative policies. Many, if not most, will do a protest non-vote in 2020, IOW.