Okay now, how about Acosta? Doesn't seem quite so bad... at least he has experience.
I see a couple of issues with Kris's solution. First, it might be hard to enforce. Second, it would be hard on the undocumented immigrants. Many of them don't have the money to just up roots and leave, now that they're here... all you get is a bunch of unemployed, poor immigrants hanging around, and that probably would not be a good situation. I guess ultimately it would lead to fewer immigrants coming, and a bunch leaving, though.
In the long term, suppose that fining employers works anyway, they stop hiring illegals, and many undocumented immigrants leave. Then, who will pick fruit, do residential construction, etc.? Maybe domestic workers will step in if the jobs pay well enough, but the cost of living will go up for sure. I don't think I'd have an issue with that personally, but I don't live on the edge.
How about giving immigrants, legal and illegal, a speedier, broader road to citizenship? One big issue here is political. I would guess that the GOP has not wanted this because of the higher likelihood that the new citizens would vote Democrat. But what if the GOP were the party that granted them citizenship?
Also, of course cost of living would go up again, and there would be more competition for skilled jobs as the new workforce became eligible for better jobs. Argh. Though as Metric Mouse points out, at least our tax base would grow.
Anyway if somebody can point me to some good discussions of possible solutions, I'd be interested.