I'm pretty convinced she will. She promised to step down as the leader of house dems. You can't lead the dems in the house for 16 years only to step down to become a back bencher. Not to mentions she's pretty old and probably doesn't hate the idea of retirement
Though ngl, it'd be pretty fun to have our own Ted Heath (sans the apparent pedophilia) or Theresa May for once.
The difference is that in a parliamentary democracy backbenchers can still have huge influence. In the US they would be bored and frustrated after being a big show for 20 years.
Incidentally May, despite being a despiaed PM, has had something of a political rebirth as an elder stateswoman. In fact the rightwing that wanted her gone has now almost become allied with her as she has aligned with the anti-lockdown right recently (although it isn't a coincedence that she has taken a lot of money from Heathrow Airport).
Sorry, I'm getting off topic. Please continue talking about 2022.