Definitely agreed on this functionality. But I don't have my hopes high on how fast can it be incorporated based on so many much needed features staying in the pipeline for months now.
Hope it gets addressed rather soon compared to other ideas!
Can I ask for an expansion on this idea a little? What problem are you currently facing when licenses are due to expire and there isn't an alert currently? Is the alert in question something you only want to be sent to administrators, or do you want all users of the system to be notified about impending license expiry?
I'm going to mark this idea as Needs More Info pending your reply.