Remember how the early 2000's-2008 we saw a lot of urban hits smashing the hot 100 until 2008 (the great recession impacted) when pop started to dominate.
Well the trend seems weird that during economic boom 2000-2008 more immigrants came into the united states causing a popularity of urban music. When the recession hit most immigrants left the states and others left to their home country's leaving white americans as a bigger audience in the music industry. Then in 2008 we saw pop started to dominate. Now the only way to see if this theory is true NOW-2015 is when the economy is starting to boom again keeping my eye on the music charts.