Honestly welcome change. The SAT Subject tests (at least for people around me in HS) were always considered as a much easier test you'd take after the AP for that very same subject. I just equated it to another way for collegeboard to get money especially since the questions were way more straightforward than AP. I am slightly concerned about what this means for schools where AP classes are not offered (I imagine SAT Subject tests presented the most accessible opportunity for these students to demonstrate their aptitude in a subject).

EDIT: changed wording in response to child comment.