It depends on where those Hispanics are from. They don't look like a monolithic block of voters to me. Lots of Spanish speaking conservatives in Florida. It seems like cheating to deliberately salt the electorate demographics via illegal immigration so that you can hang onto power.
Cubans are the only group of Hispanics that vote republican and they only have large enough numbers to make a difference in Florida
A very long wall is needed. Can't line them all up on the Capitol walls, they aren't long enough I just can't thing of anyone prescient enough to build a sufficiently long wall.. Oh wait.