That's a damn good point.
A really big issue here in California. In addition to the massive illegal alien presence in Los Angeles and the Central Valley, we have significant numbers of LPR's here, and H1-B's.
Predictably, they are agitating for the vote. And of course the Leftists want them to get it, because we all know what they will do with it: vote to confiscate money and property from Americans to give to themselves.
San Francisco (of course) is already running the "well lets just let them vote for the school board" bit. This is just incrementalism designed to get the nose under the tent - next it'll be local officials, then county, then....voting for the entire world, whoever happens to have just slithered into the country.
A citizenship test is now plausible because the Arizona law was upheld. Now we'll see if the Republicans in California have the guts to do anything like that.
I think things are pretty much past whatever the Republicans have the guts for. Just a matter of being able to count the votes as they exist on the ground today ... not a few years down the road, but right here and now.
Back in 1994, when prop. 187 passed, things were different. We could say then “hey, if we don’t do something right now, we’re going to have a big problem in five or ten years.” Well, the ‘Rat governor, and a Clinton-appointed Judge managed to gut 187, and guess what? All of the chicken littles of 1994 turned out to be right — we have a big problem, and no longer have the electoral ability to change course.
Now, the current debate in Sacramento is about the exact issue you mention: how to raise taxes on the remaining productive citizens, in order to shower benefits on the lefty voters. Heck of a mess, but danged if I can figure a way out of it at this point.