why do you think it will cause a worse disease?
I don't. I think the worst case scenario is that it (and the other vaccines being rolled out) are fundamentally placebos... People everywhere are sick of the virus, it's served some of its purposes (expanding Chinese soft power, making Trump lose the election) and they need to get it off stage without admitting how much of the scare mongering about it was essentially made up and/or fanned by China.
On the other hand those who have profited most from the lockdowns (bezos, zuckerberg et al) might want to keep it around a while and the Klaus Schwabs of the world aren't going to let go of their ideas to re-shape society so easily...
The vaccines rolling out at more or less the same time just seems a bit.... theatric, like someone is making a big show.