As people have mentioned earlier, farms that had future orders in before the price crash are probably still installing that hardware when it shows up. So that would put several months of delay before we'd see any major slowdown. I think it's more likely to see gear prices crash than diff go down. As more miners realize that it's probably going to take a long time to get back to all-time-highs, gear manufacturers are going to have a harder time finding miners that will pay > 2-year ROI prices. I think the best we can hope for as far as diff going down is a few modest and temporary drops as gear gets shuffled around from farms that go under from spiking power costs to sites that are still profitable.

Here's a table that shows the $/th you'd need to pay for gear to ROI in 12 months for different power costs and miner efficiencies at $19k and current diff. The best price I'm seeing for a new S19pro is ~$40/th.