> the training lasts 5 years. At the end of their training the year is 2021
The training lasts 5 years, 2021 - 5 = 2016 If they stopped accepting people into the radiologist program but let people already in to finish, then you would stop having new radiologist in 2021.
Training is a lot longer than that in Québec, radiology is a specialty, so they must first do their 5 years in medicine, followed by a 5 year diagnostic radiology residency program. And it's frequently followed by a 2 years fellowship.
So 5 + 5 + [0,2] is [10,12] years of training.
Residents are working doctors, so we’d start losing useful work the year we stop taking new residents.
'people should stop training radiologists now'
That sentence and what you wrote are not 100% the same.