Let's face it, there was a time when all you had to do to get traffic to a site is buy an exact match domain name. I was always slightly surprised that Google gave such an advantage simply because you had an EMD. To a certain extent it still works on bing and Yahoo, but unfortunately they have no traffic.
Anyway, just because Easy Street is over, doesn't mean it's Game Over, it's just that you actually have to build something decent now.
The main problem for big portfolio owners is that they won't necessarily be able to build out their domains quickly enough. It doesn't mean their domains are valueless.
Rgds