In the workflow, it is not possible to select a specific link present on all email marketing campaigns (without having to select them all and update them permanently).
For recurring links (e.g. online version in another language), or links dealing with a particular interest, it would be nice to be able to collect the information and target it to trigger a workflow.
For example, we want to track clicks on links to online versions in another language to be able to trigger a workflow that automatically changes the preferred language of the contact. We currently have "page views" triggered but this is much less reliable (see cookies) than clicks.