I don't think Latino Americans will respond well to Rubio's plan of essentially 10 years of indentured servitude before illegal aliens can apply to become U.S citizens.
I'm actually unclear on where Rubio is right now on legalization for illegal immigrants. What is he proposing happen with the existing ~10 million or so during that 10 year period? Would they be given status that's the same as permanent residents? Because while I'm sure they'd mostly like to have citizenship, isn't the first concern just to have the legal right to live and work in the US? If Rubio is suggesting having that, then that's still a big shift from the status quo.
Should note that my mother is a Canadian citizen who's been a permanent resident of the US for 60 years, never bothering to get US citizenship, because she just doesn't care enough about politics to vote. And with a green card, she can still live and work in the US and all the rest. Surely many of those from Mexico also care far more about being able to legally live and work in the US than about citizenship itself, no? Though maybe that's not what Rubio's proposing?