It improves on it because the barrier to entry is much lower for apps to integrate it, and the ecosystem for LCP is arguably already much larger than for Adobe Adept. There are multiple mobile apps, the thorium reader on desktop, and more.
As for LCP being around in 10-20 yrs, the idea with LCP (excluding loans, of course) is that you don't need to be online or require a remote server to validate/access ebooks you've downloaded. You just have your "password", that is used to decrypt the book content through LCP, so as long as you still have any app that supports LCP, you still have access to the publication. I think it's the best compromise that will exist in reality for publishers that still want DRM. The entire system is open-source except a small key derivation function.
As for LCP being around in 10-20 yrs, the idea with LCP (excluding loans, of course) is that you don't need to be online or require a remote server to validate/access ebooks you've downloaded. You just have your "password", that is used to decrypt the book content through LCP, so as long as you still have any app that supports LCP, you still have access to the publication. I think it's the best compromise that will exist in reality for publishers that still want DRM. The entire system is open-source except a small key derivation function.