In a way, isn't this thread a testament to Blackpink's impact?
No, it just means that you're on a K-pop forum.
Anyway, Blinks are confusing "success" for "impact" (which some sones were doing in the most successful thread). Blackpink haven't had any big impact on the scene. They've made no true in-roads into the west for the groups after them to pursue (that credit for finally opening a path goes to BTS, and even their impact in regards to this remains to be seen and I believe will be unsuccessful as the K-pop fad dies down in the west). They made big streaming numbers once the streaming era came on, but in an industry where fans are encouraged to mass-stream, it's not actually something to write home about. Their true bases of support are still in Asia, which is where second generation groups have already established.
They've certainly made popular the high-fashion influencer idol, someone that tried to get a lot of CFs with global brands, that we see with some groups like Meovv, but that's arguably a logical end to becoming an international group based in an area where high-end goods are sought after enough to even go into debt over.