Kasich or Rubio could potentially do quite well with the Latino vote in 2020.
The problem is that they do not represent the republican base.
Hispanics are extremly assimilated.
I agree with this to a large extent, however Hispanic culture is inherently in favor of larger government. Stick your head in the sand all you want, despite all the rhetoric about Hispanics being "natural conservatives" this is still not compatible with Anglo conservatism, and I will admit the republican base is justified in their concern over what the demographic deluge will mean for the future of american politics, however they are the ones to blame for shooting themselves in the foot thinking this could be reversed.