Plenty of illegals pay payroll taxes, income taxes and never collect on any services.
You apply extreme examples as being representative of illegals across the board. Look at some of the articles linked on this thread - doctors, professors, etc. They aren’t draining the system.
“But I think practically speaking we are going to have to go to a proof of citizenship system because of the sheer numbers of illegals.”
A lot of people, myself included, disagree with this and the direction we are going in towards becoming that. That, again, is the point of this thread. This isn’t a debate on illegal aliens.