Yea, that's fine, I see where you're coming from. There's a distinction between blockchain and the apps build on top of it. All I'm saying it: Steemit is a blogging platform which is one of many apps built on top of Steem blockchain. Even if it dies, Steem blockchain itself might still live on as long as there are witnesses.

Actually, if it dies, it would be the first flagship app that dies before its flagship blockchain. You probably could build a charity app (plus blogging) on top of it to replace Steemit. Steem ecosystem should stop evolving just around Steemit if it wants to survive against newer/better blockchain.