The specialisations will always exist. A good software engineer can't replace a good tester, DBA, or writer. There are specific extra skills necessary for those roles. We may not need those full skills in every environment (most companies will be just fine without a DBA), but they sure are not going away globally.

You're going to get some text out of a typical engineer, but the writing quality, flow, and fit for the given purpose is not going to come close to someone who does it every day.