Interesting thoughts. Have you made any thought if this includes different scenarios where the different mutants will be dominant? The reason I ask is that in Norway the numbers have been quite low recently and we didn´t have the big wave after the Christmas holiday as feared, numbers did actually go down a little (we had very strict restrictions at the beginning of the year) at the same time we are finding more and more cases now of B117 cases. Now the numbers aren´t decreasing but it has stagnated.
We expect though the numbers to rise again soon because it seems the B117 is getting dominant and there are several big outbreaks going on. We even have cases now with the South African-strain where they havn´t found patient zero yet, so we might have two mutations that could be dominant. So what we experience could be demonstrated in this figure which illustrates the situation in Denmark as well.
Numbers could be having a temporary decline because the old variants are dying, while the B117 is increasing. B117 is so contagious that you need harder restrictions to keep it under control - that might explain why the old variants is having such a decline.
To give you an illustration of how difficult B117 is to keep under control: We have a big outbreak in a small village in Norway by the fjords, there is 1000 inhabitants living there. There have just been a few isolated cases before. Until last week. There was a family who came back from Italy (visiting family). They followed every rule and was quarantined for 10 days as they should, and tested negative at day 10. So they were done with the quarantine and started going to work and school. At day 11 or 12 they developed symptoms, isolated themselves and tested positive for the B117. The last days there have been detected 80 cases in the town, and there are probably a few more. 500 people are in quarantine now because of that, which means half the village is affected. And 5% of the inhabitants have already tested positive in this breakout.
It seems 10 days of quarantine is not enough for the B117. When the pandemic started we had 14 days in Norway, but they changed it to 10 days some months later because it seemed it was enough for the old variant. Old distant rule seems also to not be efficient now. Old restrictions is not enough to prevent such outbreaks.
Because of that I think we will see an increase in Europe when the B117 will be fully dominant, and numbers will start rise. I´m not sure though how the situation is outside Europe, so there might be a increase in Europe but still a decrease worldwide.
The B117-threat is also the reason now why Sweden is having more restrictions.