Wells thought that because of where technology can take us that we'd eventually experience a world of Utopia (his words), but he was wrong because he forgot to take into consideration the creation of mankind. No matter the amazing technology something bad comes out of it for example the internet which all of us love but it's also responsible because of mankind, to be dangerous.
Utopia will never be experienced here on earth no matter how advanced the technology because good and evil will always exist here. He was an amazing man who was certainly optimistic about mankind which I can't knock him for that.