I think it depends on what task you do in the company. For example, we are three person to do our task, working hybrid. This is the min number of employees for it. Thus, if one of us should be replaced, a new employee should be trained for 6 or 12 months.
Yep. But, in a world of corporate takeovers, it is also possible that there are overlaps and also, the new trainee needn't be local. It is an extension of the Indian call centers and help desks, for so many more jobs.