If The Guardian is right about establishment a US interests section in next month in Iran, relationship between these two enemies could change for better gradually. The least is Iranians won't need to go to Emirates or Turkey to apply for US Visa. It has been a difficult process for Iranians in past 29 years.
I hope that no Iranians attack the US embassy or for that matter, any embassy in Iran and take hostage diplomats. It has had huge cost for people.