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Critical thinking skills are more widely applicable to every-day life than most other disciplines.
They are already taught, but hidden in various subjects.
It is difficult because even the definition of critical thinking is debated. Though many try to teach critical thinking indirectly through other subjects, students may still go through their entire schooling years and be poor critical thinkers due to the emphasis of memorization.
They are already taught in the form of history and social studies.
Teachers who lack critical thinking skills are not qualified to teach them. Because there would not be any teachers trained in the discipline after the creation of the new curriculum, effective teachers will be few and far between.