In every business decision there is always an option to doing nothing. This option is important as it brings to light the risks associated with your current course of action and how these will materialise in future.
Doing nothing is very seldom the right answer but it is an important consideration when lined up against the costs and benefits of doing something. It gives the decision makers context to the decision they are being asked to make and enables a more rounded risk acceptance discussion.
In my experience the do-nothing option should only be considered if there are emerging external or even internal factors that have not materialised to date that will significantly impact the basis on which decisions are being made.