Zion will be labeled generational next year.
If he plays like Luka is then yes you're right. It's doubtful he will play as good as Luka though just based on history.
I don't know why so many people in this thread have such a hard time admitting that Luka is special and is going to be a great player. In many aspects (such as clutch ability to close games) he already is a great player. He's doing things
consistently that 19 year old players just don't do. There is no cliff/wall coming. Players with his kind of basketball IQ, skill level, and "it factor" don't just suddenly become also-rans in their second year.
Yesterday with a bunch of scrubs (that should all be bench players) he led a comeback against the Trailblazers. He was big time once again in the 4th quarter down the stretch. Rookies almost never do that consistently and Luka has been doing it the entire season.
Assuming that Porzingis is healthy next year and Dallas picks up one more good free agent this summer then I expect Dallas to be on the rise within the same window as the Kings. That should make for a great rivalry just as the Kings had with Dallas in the early 2000's with two highly skilled offensive powerhouses.