Like the previous poster said, if they haven't taken an interest in scouting by now, they won't, period.
I'm as opposed to illegal immigration as a patriot can be. In any case, we have a large number of Hispanic families which are here legally, and I think it's safe to assume that they will have more children, and that we will have continued in-migration. The illegals ones I'd as soon deport, but that's another discussion.
Youngsters who haven't been introduced to Scouting aren't likely to "take an interest". If it's not been part of their community, they may simply be unaware or even mis-informed about the program. Our most successful recruiting has been through Cub Scouting. There are many wonderful activities available to the little guys, who then grow into bigger guys with a desire for more challenge. The satisfaction that comes with meeting challenges and growing in self-sufficiency knows no demographic bounds, in my experience. Scouting teaches wonderful leadership and life skills, which support upward mobility for the next generation. It's not just camping, even though many of us think that's the most fun.
I understand your frustration, I want our borders sealed and illegal aliens to leave with no amnesty. But with all due respect, I think this is a good thing. No, we may not get many to join, but if we save some and they remain here, it may save us in lowered crime and more productive citizens. If they go back to Mexico or El Salvador or wherever (as they should if they are not legal)perhaps they will take some of those values back and improve themselves and their countries, and we wouldn’t have as many flocking to get in here.I just fail to see a downside.