I see no fundamental incompatibility between Puerto Rican and mainland culture. We've been part of this for almost 110 years and both have survived, heck, increased each other good and badly, but that's humanity for you.
Nationalism is impracticable. One has to hate "the foreigner" in order to be a "nationalist." I don't want a Puerto Rico ruled by the whims of nationalists any more than I want to see the USA in the grips of the same ilk.
The true future is in the Union, Cooperation, and Interdependence that only admission to the US as a state can bring. Ergo, the only conservative, morally consequent position that is true to our founding ideals is to admit Puerto Rico as a State, the sooner the better.
-Theo