Will we be forced to switch to Windows version 11?

Probably not, no one was forced to switch to Windows 10 (even if Microsoft didn’t mind presenting confusing dialog boxes at the time that made some people start migrating without realizing that this was what they were accepting).

There is a chance that the migration will be free for a while, and it is already known that Windows 10 will be obsolete within five years (so it will not be secure anymore). It’s quite possible that waiting for the end of Windows 10 support is the best way to have to choose between a paid upgrade and a system that will leave the field open to hackers.

On the other hand, maybe you’ll have to change your computer before that date, and then you’ll have no choice: once Windows 11 is out, that’s what you’ll find on all commercial computers.

Finally, there’s a good chance you won’t be able to migrate to Windows 11 anyway. The hardware requirements have been increased a lot and if your machines are more than two or three years old, it’s very likely that they won’t be compatible (which is a totally political decision from MS, as Windows 11 is not much more than a marketing move. Under the hood and the refreshed interface, it’s still Windows 10).