The household robots may not be here for 20 or 30 years, but part of this fanciful scenario could probably happen right now if you wanted it. Voice-controlled computers are here now. Large-screen displays are here now. The Ananova site already offers interactive news, albeit on a small screen. Three-D images without glasses can be achieved using various techniques that have been available for decades, but so far, such displays haven't made been widely adopted.
Holographic displays require teraflops computing speeds, as well as special displays.
Dimension Technologies has been working for more than a decade on systems that work like those on the covers of some children's books that use a vertically striped lenticular screen that shows a different image to each eye. This we probably won't see until second-generation wideband shows up later in this decade, although such data rates are achievable now on various private networks such as Internet 2. For 3-D without glasses, we may be looking at anywhere from 10 to 30 years. But eventually, I think it's bound to come. They're obviously trying to popularize 3-D over the web.