That's assuming that humans won't get smarter either. I figure that within 14 years that humans won't actually biologically age. This is a big deal because high school education was a requirement when people were expected to die by the age of 40. People today live much longer, and are expected to live even longer and healthier lives. So we need to make college education a requirement, including those who are middle aged or older. And you should be able to go to school as many times as you want, throughout your life. This will likely be what people do in the near future.
Then you have technology that promises to genetically change your DNA. We could see this become common practice within 29 years. We could give you genes that makes you smarter. The United States has an average IQ of 98, which means at least half as many people are well bellow that value. What if we gave those people genes that make them not only smarter, but genius?
Then we have the potential to merge with machines. Technically we're doing this already with computers and phones. If you wanted to know the Capital to France and you weren't paying attention in 3rd grade, you could just Google it. If you wanted to solve a math problem, you'd just use a calculator. All this stuff is expanding your intelligence. If Ray Kurzweil is right, in 30 years we'll have chips in our heads to talk to computers.
So no, there won't be a brain drain but a brain gain. This creates more problems than it solves. If everyone had an average IQ of 130, nobody would even sit down to program a iPhone app because it's beneath them, let alone take out the garbage. They'd be tool busy trying to make a warp drive, or fusion energy. Or better yet, synthetic humans to make iPhone apps and taking out the garbage.