The myth of loyalty in organisations

Often, organisations think that length of service is a great indicator of loyalty.
However, while this could be true in some cases, often, it may not necessarily be a desirable parameter. Loyalty is invariably to a profession, and that is not measurable merely by length of service.
Experience should not be , in the first instance, evaluated by what one has undergone or by the duration of efflux of time, but by the value learnt, that is relevant to the organsiation's mission.