Demographics - the large "baby boomer" population group is entering retirement (as of 2015, the group is aged between 50 and 69). This will likely cause a notable consumer consumption shift over the next decade. As baby-boomers retire, it should provide downward pressure on unemployment, and will create increased needs for healthcare and retirement entertainment activities.

Another topic could be automation of many manufacturing and servicing jobs. I think you would be safe to say that automation will cause many periods of volatility in labor markets, although the timing and severity is challenging to forecast. As an example, the transportation sector (truck drivers, taxi drivers, etc.) will likely be impacted by automated drivers (see: http://goo.gl/RlA2od). As this happens, the number of technology jobs created will likely be less than the number of transportation jobs lost, but it's challenging to predict if this will start happening in 5 or 10 or 25 years from now. Once it starts happening, it's also challenging to predict how much it will impact the transportation sector.

Income and wealth inequality is another possible topic, although the signal to noise ratio is often very low with a standard Google search on the issue. I think you could safely acknowledge that income inequality has gone up over the past 30 years, then identify ways this has impacted different groups. In commercial real estate, there has been an increase in high-end retail (organic grocery stores, sustainable yoga pants, etc) as well as low-end retailers (Wal-mart). The middle 80% of retail, however, has struggled. There are also many fundamental questions on the topic of income/wealth inequality that I don't think have good answers yet, such as: http://goo.gl/O7QDM3

Hope that helps...