It's like saying that there will be no more exciting music and it all pretty much ended with Mozart and Beethoven. And one thing that is very consistent for human kind (with few very bright exceptions, of course), is the poor ability to predict future innovations and technologies. If you look at 100 year old drawings of year 2000, you will see flying steam engines, coal powered robotic maids and biplanes used for public transportation. So.. let's just wait and see what happens. A cure for cancer may be just as exciting breakthrough as electricity was in its time, and it may as well be just around the corner :)