I think this would be more at home in /r/askscience
But I'll put out there that the major difference in people being taller today vs in the past is due to nutrition. Today kids in developed countries have access to very good nutrition, where as in poor countries they don't have access to good food supplies and thus won't be as tall.
There are some studies on this using Koreans as subjects as those in the South have good nutrition vs those in the North don't have as good as a diet.
tl;dr No, people won't keep getting taller in the future.