Voice Control of HA has been around for several years. Hal2000 & HomeVoice were available in the '90s.
IIRC, Dr. Edward Cheung used one of those in his house. He posted frequently to comp.home.automation. He even suggested using FRS wristwatch radios although I don't know whether he actually implemented it.
I first got involved with HA & X10 in the mid-90s because I had written some software that allowed people who had lost the ability to speak from brain injuries, ALS, etc. to use text-to-speech on a PC or laptop to speak. They could even use the phone with a speakerphone modem. Adding control of lights and appliances seemed a logical progression. I got to know a lot of severely disabled people who needed assistance. One was a young engineer who was a quadriplegic from a diving accident who used voice control for nearly everything. But he was the exception as it really wasn't ready for primetime back then. In olden days it was not very good and required expensive mics, good audio equipment, parabolic reflectors, etc. and there was a limited vocabulary that had to be spoken precisely. That entire area was disrupted by the Lernout & Hauspie scam which bought up all of the speech related companies, including the Truvoice engine that I used, before their pyramid collapsed.
Speech recognition has probably come a long way since then. The automotive market has driven the development of new chips with more sophisticated algorithms but I really haven't investigated it lately as it never appealed to me but if that's your preference, have at it.