Agreed. In many other countries, the English spoken by many in business will be far superior to the American’s second language.
The other thing about Portuguese is that is far easier to pick up if you are proficient in Spanish, as in beyond the level 5 Spanish at most boarding schools. Those relatively few colleges that offer Portuguese usually offer a Portuguese for Spanish Speakers track. So if a student is really interested in Portuguese, they are better off getting as close to near-native fluency in Spanish and tackle Portuguese in college.
The Field of Dreams approach to curriculum development has demonstrably failed at most schools that tried to offer Russian, Japanese, Arabic, so I don’t see other languages being added in the near-future.
And just a plug for Spanish. It is by far the most useful foreign language for anyone living/working in most parts of the US. Plus the literature/theater/cinema canons have a much greater breadth than many other languages.