Invading one of the US major oil suppliers in this time of instability in the market and high prices would not happen.
A coup would be on the tables but at the moment there is enough going on in the world without this to deal with.
I believe that the US just wants stability and are willing to sit this one out.
You don't get stability from clowns like Chavez, anymore than we stability from Ortega.
You get insurrections in neighboring countries, and a huge mess to deal with.
But I do agree that we won't be invading. A functional CIA should be able to do the trick (thank goodness we have Porter), just as it did in Chile.