The Japanese also believed that useful generalized robots were coming int he  1990's and spent billions researching it. They eventually had to admit to  themselves that the hardware/software just wasn't there and wouldn't be for  quite awhile.
If you look over the last 15 years there has been an  explosion in AI. One small example is 15 years ago airlines did the maximization  of seat use on their flights with humans, and it wasn't sure how long it would  take computers to be able to do it. Today computers do it all, booking the  seats, setting pricing, scheduling their flights to maximize revenues. Its  almost taken for granted that a computer would do those things  now.
Also realize the commercial incentive is going to be insane.  Right now there is no point trying to develop an AI robot. Because your average  computer still does about 100,000 times less FLOPS than a human brain. That is a  big step up from 20 million times less FLOPS a decade ago, but still something  that a human brain would recognize in 1 second, would take the robot over 24  hours to figure out!! 
However in the 2030's when a computer might figure  the same question out in 1 second, its a different picture. At that point the  googles, microsofts, facebooks and friends of 2030's are going to be in a race  to bring out useful AI, and updating at a furious pace. No doubt there will be  many hard problems.. but they will be able to put thousands of super genius  programmers and philosophers and working on them.
The problem with the  people who are betting against technology and saying its impossible.. is they  are betting that of thousands of teams of geniuses around the world, some with  near unlimited budgets, none of them will make any breakthroughs.
Its the  same problem with the peak oil crowd. They are always betting that mankind will  never be able to come up with new ingenius ways of extracting the oil. All it  takes is one engineer somewhere to make a breakthrough and their theory is  shattered. 
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