The jobs will not dry up, they will find ways to get around any laws that are passed. There is such a thing as supply and demand and the demand for low paying labor outstrips the supply. You may as well try to empty the ocean with a bucket.
Pray for W and Our Freedom Fighters
If harsh penalties for employing illegals are enacted, and employers and businesses want to play Russian roulette with huge fines, I guess that is their call. Would you take the risk with your business, or the headache and expense of a court battle if you wanted fight a fine? I wouldn't.
All criminals work to find a way around the laws. That's why they're called criminals. And why we have to enforce the law instead of merely suggesting to criminals they please try to be nice. A drop in the bucket? Sure. But it's enough to keep all hell from breaking loose day in and day out.