That those countries already have/or soon will have a rapidly growing old population?
As I said before, a) not enough processing power yet to have a robot do flexible and autonomous work on "his" own yet, unless you get a human brain to work with the signaling (which would cause a lot of ethic questions and bruarahah) and b) right now it seems challenges pertaining to mechatronics/electrical engineering/battery life etc. make it almost impossible to let a robot do all the physical work in a satisfying way. No point to carry grand-grandma up the stairs, put her on the toilet, watch that nothing goes wrong, put her up, wipe her ass, carry her down, cook lunch, etc. when the stupid thing already fails at getting up the stairs without loosing balance or another gazillion issues. Not in this decade...but perhaps still in this century? (OMG I'm now an optimist too).