Originally Posted by LokiDionysos
I'm just gonna hint that Fury did say the cure he gave Tony was only a temporary fix...
And there's more to Tony needing Extremis from the "good" doctor.
Mandarin has spies everywhere and knows just what to offer Tony that's the perfect solution to all his problems... Or so he thinks. This is a trojan horse tactic and there's a lot of other things that come with Extremis besides the permanent cure and new powers Tony is seeking.
This is BS, first off the "temporary" fix was the shot of the Lithium Dioxide that Black Widow gives him to "take the edge off". The new element powering the Arc reactor was never said to be temporary.
Tony probably will want the Extremis formula to permanently solve the shrapnel problem, but he's not going to have blood poisoning again.