He will get invited to Chicago again, and run his usual 13.1 miles, and then fade off to a Van that is waiting for him on the
side of the road. That act will repeat itself in some Marathon at the beginning of next year. More than likely it will be Tokyo.
He is a human trophy, and traveling from place to place to show himself off as the WR.
He is the only runner who can get away with that, because he is the WR holder. However, once someone breaks it, and that is a big IF, the eating will stop.
Dennis is a nominal elite runner: in name only. He no longer has any physical power or ability at the elite level, basically, he is an ambassador runner. It's like celebrities who get invited to throw out the first pitch at a baseball game.
I'm not mad at him, soak up as much gravy as you can until the train ride is over.