20-Year Prospect
Sports in America aren't going anywhere, and neither are the people who call the games for the millions watching at home. Cable sports channels are some of the most popular options on television, and thanks to the wonders of digital streaming they're becoming their own juggernaut internet empires.
The biggest changes in the sports industry are going to be to the sports themselves, so it's up to the sportscaster to keep up with those changes.
For instance, instant replay in football has completely altered the game—not only do wrong calls get reversed all the time and coaches spend time-outs trying to reverse good ones, but sportcasters now have many more minute-long breaks to fill with the wonderful sounds of their voices. With so much pressure on officials to get every call right, this will only increase in the coming years.
As long as you can make a bunch of referees standing around talking seem like the most interesting sixty seconds in this history of athletic competitions, you should be set for many years to come.