Its going to be very interesting to see how it plays out because you certainly have a few different cohorts who will take differing actions based on the price
Eg I would probably be happy to export down to say 50pence as long as I can still import for 30pence, I don't think I would consider lower then 20p profit per kwh since its wear and tear on the batteries, conversion loss, and they current save me 20p roughly in normal operation
But the people "sitting in the dark" would surely mainly have a much higher threshold, since for many they are only gaining a few £ max now.
There will a group of "die hard" savers who will carry on and be happy with 5p for sitting in the dark for an hour.