Apparently, they don't teach logic in the Jesuit seminaries these days. Or in the journalism schools.
How does the fact that "most Americans are fluent only in English" have any bearing on any one particular individual who would be a candidate to the papacy?
There are many reasons why an American pope is extremely unlikely, but the above is not one of them.
JPII has demonstrated that his successors will have to be linguists. The only American cardinal who speaks a second language fluently is Mahoney, the language being Spanish.