I can't speak to whether governments, in their modelling, are aware of a fourth or fifth wave. From a forecasting perspective, you can see that wave one was smaller than wave two. Wave three is bigger than wave two. I think that many people can foresee that if we don't get the vaccinations out fast enough and if we don't get ahead of the virus, there will probably be a fourth wave and there will be a fifth wave after that.
Hopefully, if we vaccinate, the fifth wave will be smaller than the fourth wave. It's a race against time in terms of timely administration of these vaccines so that we don't get repeated curves that continue to spike up quickly, especially when the new variants are more infectious.