We will probably don’t understand it at the beginning. But I do think eventually machines and humans will be very similar. Changing our biological bodies for synthetic ones is the next big step in my opinion.
If we ever reach that evolutionary state, what comes next is hard to say.
So, you're thinking of something along the lines of The Singularity? I suppose an evolution such as that wouldn't necessarily be as concerning since it would effectively be upgrades to humans, not a completely separate entity. You're right though that whatever comes beyond that is very hard to say.
Exactly that! It would be our next step.