It's a good day to provide an opinion about the fed funds rate (even if we haven't gotten to talking about this), so I'll provide another one, haha:
Unless the house is cleaned out and a different perspective is brought to the table, the fed funds rates that you used to see pre-GFC aren't going to come back. If we're lucky, you might see a 2% fed funds rate by like 2025, but I'm doubtful here. My guess is if they're even able to start, they stop for a reason that we'll know later at like 1-1.25%.
I am too young to really remember those rates, but I'll acknowledge it, the fact that I feel it's unlikely that you'll ever see a decent fed funds rate ever again is just a crappy situation.
Now, if you somehow do see the house cleaned out and somebody decides that inflation needs to be fought (as I'm not sure 2% would even do it), you could see a stock market crash based off fed funds rates. But is that going to happen? Unlikely.
That's why I kind of scoffed when I saw somebody ask what would happen if the fed funds rate was raised to 2% over the next few months at another place. Because that's not going to happen that fast, you're in luck if we even get to 2% over a period of time.