My first thought will be: Oh great, now I can have a second chance to invest a decent amount of money for my future. I am glad. I should have taken the chance the first time but this is ok too.
My second thought would be: Because of the amazing crash down to 1k, Bitcoin will need years to recover to 20k again. Which is a bit disappointing for those who like seeing big numbers, but I am hodling for years anyway. And the profit in percentage from Bitcoin going from 1k to 20k will be greater than waiting for Bitcoin to go from 20k to 200k, (which I suspect will also take a few years at least).
Now the 10k drop scenario is seen as quite expected, but I haven't seen anyone seriously consider dropping to 1k. Well, it would be a great opportunity and I would buy some bitcoins, but such a strong drop would make me think and it would be important to analyze why this happened. On the other hand, I do not allow such a scenario, and therefore there is no point in thinking about it yet, issues need to be resolved as they become available.
Honestly, I don't believe people will buy bitcoin if it drops below $1000, then panic and fear will cover all of us, we will doubt and start questioning the future of bitcoin. I don't believe everyone will buy it, more people will run away than buy it.
If bitcoin drops to 10k, I believe many people will buy it because it is really a great opportunity. But if bitcoin goes to 1000$, I will be skeptical and consider it risk more than opportunity, but the risk is worth trying, I will buy some to try my luck, but I wont go all in.