How to prevent brain drain

New York! Chicago! LA! Miami! Lights! Glamor! Fashion! Opportunity! Sure, all these words represent some of the nation's 'finest' cities, but here's my question: is it always good to promote these cities in small towns? Isn't this fastest and easiest way to cause 'brain drain'. I know, certainly on an international basis, this has proven to be the case. We look at the Asian powers of China and India and the wave of immigrants that fled west in order to seize more opportunities and make a better life for themselves and their families. 

However, what is important to note is that after realizing these dreams can also be acquired in their home land, these innovators are staying back, helping China and India boom at exponential rates, making the United States fear them more and more. 

So why not have this on a local basis? Why shouldn't we, as a society, promote the development of towns rather than flee to what may appeal to the Creative Class? Why not make our "brain drain" towns into those that after years of development, will be seen as the "place to be". This may sound strange as someone who has lived in London, New York and Chicago, but without decades, even centuries of development, these cities too may have become just a regular old town in fear of becoming "dead".