At will policies may prevent one from rationally investing future intentions in the specific organization. That means that in many cases, employers are functioning to their own disadvantage by failing to
offer security. Those who do demonstrate the greatest degree of talent and
potential are likely to consider an at will circumstance as a training
ground by which future opportunity may be sought with another organization.

Talent Management:
Talent management is yet another area that suffers when employees
commit to an at will policy. Particularly, the outward unwillingness of
the organization to offer its employees...

This should be seen as a significant obstacle to effectively yielding qualified personnel or achieving a consistency in the output of
product or service. The outcome is instead one of high turnover, low
working aptitude and limited motivation to improve. Levying the threat of
arbitrary termination is a decidedly ineffective way to build toward a long-
term organizational success and therefore seems to stand in contrast to the
goals otherwise associated with the hiring, training and use of talented
personnel.