I couldn't help but think as I played Terraria that it would be nothing but dust once Starbound emerges. Seeing how old the game is, and the nostalgic value it has, I'd like to suggest implementing rare (if not scarce) creatures that could resemble or come straight from Terraria's designs, such as slimes, or bats. Same could be said for weapons and items too, but I could not find a place for a universal suggestion like this.
Talking about the 1.2 update, Terraria will probably live for another 5 years, including 1.2.x updates.