I'm not sure I agree.
If you have followed one of the bigger stories in reform these days - the successful turnaround of Brockton High School in Massachusetts - you might consider the impact of improved literacy on all classes. This teacher-led reform centered around the basic concept of literacy in all classrooms.
If literacy skills are low, nothing else matters. And too many teachers in the content areas simply assign reading rather than teach it. English teachers in lower grades teach how to decode, then read. After that it becomes about content. Thus, at the upper levels, they teach the kids how to read various genres. Social studies teachers should do the same. And same with math and science. Once students have memorized the times tables and the formulas for basic math, it's about problem solving. That's why story problems matter - it's application of the abstract concept.
If literacy skills are low, nothing else matters. And too many teachers in the content areas simply assign reading rather than teach it. English teachers in lower grades teach how to decode, then read. After that it becomes about content. Thus, at the upper levels, they teach the kids how to read various genres. Social studies teachers should do the same. And same with math and science. Once students have memorized the times tables and the formulas for basic math, it's about problem solving. That's why story problems matter - it's application of the abstract concept.
There is much to consider in reforming schools, and no single issue or reform is the panacea. However, the importance of all teachers "teaching reading" in all classes is pretty high on my list.