There are 2 main reasons to update your elearning.
The first is that your content is out of date. This happens over time. Processes change, locations change, people change. If these things are important for your learners. you should always update your elearning courses.
The second are that your course is old and boring. The functionality of elearning has improved significantly over the last few years and it is now possible to develop courses that are much more interactive and engaging for far less. Talk to your elearning developer if you need guidance or ask for some demos to see what is possible.
If you don’t have an elearning developer but would like more information, feel free to get in contact.