The problem is opportunity cost. Schools (highschool, college intro physics) spend a great deal of time discussing previous models of the atom. What's the value of teaching Thomson's plum pudding model of the atom, really? They could start with the current model and list all of the observations/experiments that have shown the model to be useful. Previous models could be relegated to an appendix, or a history class.
This would free up time to more comprehensively discuss 20th and 21st century physics, which are sorely neglected at this level.