The last thing the Republicans want or need is another state with maybe 18 EVs that automatically end up in the Democratic column.
I don't see this happening ever.
From what I can tell, a lot of Republicans seem convinced that because the current Governor of Puerto Rico is aligned with the Republicans and because they (the GOP) thinks that all Hispanics are socially conservative, that somehow means that Puerto Rico will be a Republican-leaning state if the GOP can appeal to Hispanics.
I don't understand the logic either, but it's there.