"The Veldt" presents technology as something that makes life easy—maybe too easy. In fact, technology makes life so easy that it's not even really living any more, according to George. Most of the technology in "The Veldt" seems to ruin the perfectly fine way of life that existed before. So the kids aren't reading anymore or even going out to play; instead, they're just playing with the newest cool gadget, the nursery. (Which is, believe it or not, cooler than the Wii or iPad.) But despite all the cool tech, it's clear that in "The Veldt," the more technology you have, the more dissatisfaction you have, because you start ignoring your family and start hanging out with felines.
Technology in "The Veldt" ruins the humans' relationships with real life. Real life isn't supposed to be easy.
"The Veldt" isn't about technology. It's about how different generations deal with each other, and tech just provides a way to describe that interaction.
In "The Veldt," family is the opposite of technology. What we mean is that families are supposed to be one way in this story (as in, kids are supposed to listen to their parents), but when technology is thrown in the mix, everything goes topsy-turvy. Lydia doesn't do the housework (the horrors!), the kids make their own rules, and father George definitely doesn't wear the pants. So, in "The Veldt," technology can mess up that normal family we've all grown used to. This probably wouldn't matter so much if it were just one family, but family here may be a small version of society; and if the family breaks down when they get new technology, there's not a lot of hope for the rest of us.
The family in "The Veldt" is a microcosm of society, which is to say that we're all doomed because we watch way too much reality TV.
Bradbury's idea of a normal, typical family in this story is old-fashioned, but the story still has lessons to teach us about how to treat Mom and Pop.
Dissatisfaction: it's what's for dinner. That is, if your automatic kitchen is doing the cooking and you yourself have nothing to do. In "The Veldt," thanks to technology, people are unhappy. Lydia Hadley doesn't work and feels useless; George is so unsatisfied that he's smoking and drinking too much; and the kids are so dissatisfied with their parents that they've found another parental figure. (Spoiler: it's the nursery.) We could say that, in "The Veldt," dissatisfaction comes from the effect of technology on the family. But this story isn't just about some made-up technology; it's very much about the 1950s, when people came home from World War II to discover they had money and lots of stuff, but weren't always happy.
Bradbury's characters feel dissatisfaction rather than something more extreme (hate, depression, etc.) so that more readers can relate to the emotions.
Bradbury presents dissatisfaction as something that can and should be avoided. We can all be happy, if only we know what we really need.
"The Veldt" is a story about a virtual reality room that gets out of control. But it's also the story about how parents and children don't see eye-to-eye. Even when they're looking at the same stuff. For instance, Peter and Wendy probably think a trip to New York is fun; but George and Lydia look at that as a Very Bad Idea. To the kids, the parents are overbearing tyrants who should be fed to lions. But George and Lydia think they're laying down reasonable rules (like don't kill anyone. That's pretty reasonable.) So while the virtual reality room lets different people live in different realities, in many ways, they already do.
The virtual reality of the nursery is the only reality that matters, because it has the biggest impact on the characters in "The Veldt."
"The Veldt" shows that it's a bad idea for people to learn about the fantasies of others.