This is a rather harsh way to deal with hosts who exit their server prematurely. I certainly don’t like the idea of disabling hosts from hosting their server just because they leave. Gameworld server hosting by anyone is a core feature of the game, and the backing reason supporting its limitation is weak in comparison. So what if they leave early?
As for the suggestion itself, it seems rather pointless. Players could just farm rep and then blow it away at a moment’s notice. You can’t trust a system to accurately predict that the host won’t all of a sudden quit. This system wouldn’t change anything in players, and might lock others out of core features of the game in the process.
The gameworlds, I should add, aren’t nearly as big a deal as, say, a competitive match in a game like CS:GO, with serious moderation and real, global competition happening in real life and remotely online and with money being betted on professional teams and such. This game’s gameworlds are far more like an online LAN party than an ‘event’. Ergo, there should not be any punishment for messing around or leaving early in this game.