Their wintering habitat is comprised of a relatively unique forest type, so it is extremely important to protect the habitat that supports them. Unfortunately, these high pine-oak forests are a very threatened habitat type, primarily due to clearing for agriculture. Much of the pressure comes from subsistence farming, as local families cut down the forests to plant crops to support their families. As this practice continues, the forest is disappearing and being replaced by small farms. Logging is also a problem, particularly when trees are removed by clear-cutting.
Commercial agriculture including coffee production can be a problem as well.
It sounds like some of those commercial products are being exported to the U.S. and other countries. It's difficult to say. When you look at the host of threats that face migratory birds, there are many industries that end up contributing to forest destruction. Native plants and forests are cleared to produce ornamental plants and decorative flowers in Latin America. Trees are being cut at an alarming rate in some areas, and the resulting wood products are transported all over the world.