Join your local club and ask what investors are looking for (Area, Price Range, Type, Acreage) then focus on the areas that have the most common demographic based on the investor's input.  

I think that doesn't make sense.You are correct to identify that the demographics of home-ownership are changing, and you are correct to think that such a shift will have consequences, but it probably won't be as simple as an "investor sell-off".Some things I think about: Investors perform maintenance on their properties in different ways.

Find a target demographic i.e. tax delinquent, code violations, recent evictions etc....Go on the public records site i.e. assessors website(Taxes), Building department (Code violations), Court records site( Evictions). 

I know plenty of moron investors and moron real estate agents.The problems are multiplied in Cleveland due to demographic shifts happening there.

Newspaper, bandit signs, radio, TV, Bill boards, etc. produce calls from all demographics some of which wont fit you business model.

Examine the demographics, (Orlando is pretty easy), and target that market.Consider your exit strategy, (Buy/Hold/Rent, flip, wholesale, etc).

We have been fortunate due to the demographics and unemployment rate.

The demographics makeup of this county is ready to explode. http://www.biggerpockets.com/forums/99/topics/108652-atlanta-market-update

This demographic does not skew to the irrational, uninformed or impulsive.

the low value assets like on your site out in the mid west have a pretty high mortality rate over time just based on demographic and income levels.. but if your buying them cheap enough and its your bizz and you like it..