The risk is of course that the new thing might be worse than Teams somehow.

The only possibility is if you get it from Oracle instead.

Well no, there's always the European Oracle: SAP.

It's a good thing in this context that they are on the other side of the border.

It will surely be worse, at least at the beginning. But there is a significant chance that with time they will improve it, and one can hope that one year after the first release the product will actually be better than Teams, given that the developers will improve it based on their own experience.