But read what I wrote. The incentive already exists, and it will continue to exist for years, if not decades, unavoidably.
In the short term, I don't think there's a way to stop them from coming. Hell, in the medium term, I think the same: if I was a dude in northern Mexico, just trying to live my life, wanting to do it in my own country and never really thinking of sneaking into the USA, but then my city buses start getting smoked?
I've got some decisions to make. I don't want to break anyone's laws, but a law that condemns my kids to death is a bad law and I'm going to disobey it. You would, too.
I know many naturalized Americans who came in The Right Way, and all of them are proud of themselves... but all of them agree that the US makes it too difficult to do this The Right Way. So therefore, people will do it The Wrong Way. Whether we want them to or not.
This nation is not willing to be draconian enough to seal the southern border. I know many people here wish we were, but we're not. So we need to be pragmatic, admit we're losing the "battle against illegal immigration," and figure out a workable way to decide where to go next. An expensive but useless wall is not the way that gets done.
JMO.