Best case scenario for Iran

Although a similar thread is already made.

But as the title says, what'll be the best case scenario for Iran after 1900s?

It can remained as Imperial, Republican or even the Islamic Republic we know.
 
Under Mossadegh were the US does not reinstate the Shah. Mossadegh's Iran may not be a full functioning Democracy like in the West but it will be as stable, or even more stable than Turkey. No economic or intellectual drain from Iran due to Royalist or Islamist persecution. By 2015 Iran is the most developed Muslim Nation in the Middle East at least.
 
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