It is indeed subjective. But since I have hired both good american and non-american engineers consistently over long periods, I tend to think it is not unrealistic.

I completely agree large scale abuse of the program must be stopped. No country can afford to have large influx of new population that hinder their own(however "own" is defined in a country) progress. Borders are a thing (for better or worse) and invoke extreme emotions within society, and that must be accommodated and not ignored. I say this as an H1B employee and I see this play out a lot more radically in my home country