The situation in Iran will get much much much worse before it gets better.
Khamenie has put himself and the country in a terrible corner. Regime supporters and opponents are filled with hate and nobody is interested in talks anymore.
scenario one negotiations With Dem President:
if Trump is not reelected (I would say only 45% chance of that). a new administration does not take office until a year and from now.
like before they are going to negotiate about negotiations for about six month.
the real "fruits" of negotiations are not gone yield any results for about two years from now.
the cycle will then continue, if khamenie or somebody like him running the show is around after that american administration ends.
scenario two negotiations with Trump :
Trump is reelected (More than 50% chance). The governing regime has officially run out of last cents of savings.
it has to negotiate and concede a lot more to Americans.
This will precipitate falls of loyal fan base. Governing Regime will continue to live a bit more like zombie
scenario three regime toppling:
A Million dead will be on the street before the governing regime is toppled.
Afterwards the most violent type of protesters will take to power.
There will be widespread executions.
There will be strong separatist movements in provinces such as Koredestan, Ilam, West Azarbayejan, Khuzestan, Sistan Baloochestan, Golestan.
This will results in more violence. at best Iran will have an "Iraq" like democracy after 10 years.
where foreign powers and local corrupts will own their own faction in parliament.
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it is hard to see things in Iran getting much better with the current governing regime in power.
unfortunately things can also get much worse when the regime is gone for a period of 10 to 20 years.
Iranian people are stuck between a rock and hard place for quite some time.