What if Eagle doesn't maintain in the future?
Since Eagle is a local-based application, not a web-based service, contents you've collected are only stored in your local device, thus your collection won't be impacted in the case that Eagle no longer maintains or the server is down.
What if Eagle team no longer maintains the product in the future? You can also rest assured of this. By then, Eagle team will make Eagle an Open Source software, passing the mission of development and maintenance on the Open Source Community's hands, so your collection over years within Eagle library can be kept forever.