Blogs will still exist. They will be more difficult to find, just as everything not LLM generated will be more difficult to find, and people will just have to accept that everything they put online will be added to the training data of countless LLMs. But that's already the case and it hasn't stopped people from creating things, including blogs, in spite of LLMs. It may be the case that they mostly wind up on federated platforms or on alt-webs like Gemini. People will still express themselves the way they always have because people want to do that.