Ah, but my dear sir, it IS inevitable. The reason for this is simple: it's already a done deal. The illegals are outbreeding the productive sectors of society by a significant margin. If you live in SoCal, a little drive down Harbor Blvd will open your eyes. Take it out a generation or so, and it's obvious to anyone what's happening.
Pesonally, I don't mind any longer. There's something called the 5 stages of grief: denial, anger, attempted resolution, depression, acceptance. Those of us who fought the earliest battles over Prop 187 back in the early 90s are well past stage 5. They won. Accept it and start dealing with how society will be structured in the future.
Me, I look to So. America. After all, if the US was merely a reflection of the societies/cultures/values of its earliest immigrants, then why would this not hold true today? The point is, it does. Therefore, the US will tend to increasingly resemble Mexico City ie where the immigrants are coming from today.
Is this a bad thing? No, not really, as long as you're part of the productive class. The wealthy/middle-classes in So American live like kings - their purchasing power is tremendous. We're already experiencing that in SoCal - no one I know never does any of their own yard-work, etc.
One other thing: I think the real opposition to illegal immigration is NOT because it's against the law. It's skills and education. If the illegals where all engineers, there wouldn't be a peep. How often are these threads directed at Asians? None, even though there is a significant amount of 'illegal' immigration coming from there as well.