Yes. Yes it will. And, likely, it will be a good thing for communication.
In the case of voice-to-text technologies, however, all writing becomes a kind of rehearsal for verbal interaction. In this light, an important effect of computerized dictation technologies is that they could lead people to become more skillful speakers, and thus more thoughtful participants in meaningful discussions. If writers of the future are composing text almost exclusively through computerized dictation, then they may become more thoughtful and nuanced speakers in the process.