Wales has enough economic problems without the schools producing kids who cannot function in English.
Beautiful country, Welsh ESB will always be a favorite, but way too far to the left.
Students taught in Welsh are perfectly capable of functioning in English. In fact, their fluency at the junior high level far exceeds that of 1st year U.S. college freshmen.
they will function in English, just as the Dutch or Swedish are perfectly fluent in English as well as their own tongue