Calculators, especially scientific and graphing calculators, are a niche product these days, almost exclusively limited to education and exam-taking. There is no impetus for changing the approved models, given the mountains of materials adapted to their use (TI actively worked with various educational bodies to promote the use of graphing calculators and helped prepare the curricula using their own.)
Don't expect great changes in this area, although the impending death of the Dept. of Education might shake up things. Not for the better, I think.
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