The numbers are pointing to a shortage of gastroenterologists.
However given the source of the data, I’d be a little dubious. Olympus Corporation of the Americas, a company that manufactures endoscopes, commissioned the study. It certainly would be in their best interest to have more gastroenterologists trained, and use their scopes.
That being said, a recent NEJM study, which showed that colonoscopies aren’t as accurate as initially thought, may indeed legitimately drive up the number of screening colonoscopies. If that data is validated, then yes, more gastroenterologists would certainly be needed.