With proper installation care and maintenance, your laminate-to-carpet door threshold should hold up for as long as your flooring itself.
Laminate carpet joiners don’t require much maintenance at all, and regular cleaning is quick and simple. All you need to do is wipe them over with a dry cloth to remove any dirt or dust that has accumulated and wipe up any spills that happen immediately to prevent staining - making sure to dry your threshold immediately afterward if you’ve used a damp cloth.