I don't but it the number is too low. 4 million estimated illegal aliens enter this country annually, yet there is only 10 million here? Try somewhere like at least 26 million given the idea that some may return home. Half of them are living in the State of California.
When Californians cannot find an open hospital inside California due to the illegals who show up at hospitals and get treated even though the doctors and nurses know they will not get a dime ever, maybe then they will realize they need to close the border. Chances are, they're will be a mass exodus of the working class from California, leaving it over run with illegal Mexicans who do not support the state through taxes or anything economical and the property values will plummet to fractions of their current values causes a total economic collapse. My guess is 10-15 years tops.
10,000,000. Ten million. History will not be kind to our political "leadership" from say 1965 on.