Institutions often thrive after visionary leaders, once seen as irreplaceable, make their exit.
However, some contracted activities, from training Iraqi forces to strategic communications, are likely to increase as troops withdraw, and certain U.S. contractors are seen as irreplaceable.
Obviously, Facebook isn't about to disappear overnight: it has generations of users and a huge number of companies who see it as irreplaceable.
Mr. Lomax saw folk music and dance as human survival strategies that had evolved through centuries of experimentation and adaptation; each, he argued, was as irreplaceable as a biological species.
You're not as irreplaceable as you think you are, so make yourself irreplaceable to the people and things that matter.
Are you sure you're as irreplaceable as you think you are?
As Olympus has a 70 percent market share in endoscopy, the scandal caused anxiety and concern among the medical profession, which sees Olympus endoscopes as irreplaceable.
Conservationists see the irreplaceable ecosystems services provided by the valley.
A spokeswoman for the Woodland Trust said: "Whilst the planting of two million trees is a great contribution towards increasing the UK's minimal native woodland cover, it is important that this isn't seen as a token gesture in what could potentially see the loss and fragmentation of existing woodland habitats, which are of far higher conservation value and in some cases irreplaceable.
Although death is seen as a natural phenomenon, part of the normal order of things, it is often an ordeal and a tragedy for those who witness it, as death is not merely the end of a life, but also the end of an existence, the loss of a unique individual who is special and irreplaceable.
Translators used to scorn this, seeing their human judgment as irreplaceable.
