it would probably slowly start coming out as dual ac and dc connections and start with "garage appliances" like your laundry, central ac / vac and car charger since the garage is the cheapest place to wire something into.
However there are a lot of things that won't work on DC as well. Since very few people are running mains voltage DC labels often will not tell you if it will work. (I've toured ships with mains voltage DC and those outlets are labeled - I assume the crew is trained - or perhaps was since this is just a museum now and I'm not sure if current ships use DC)