Technology also gets as good as necessary and not necessarily further, for long periods of time.

Babies have "colics", which are probably some kind of pain that we haven't identified yet, but because they go away on their own and parents are taught that they just have to deal with them, we still apply a medieval solution to the problem ("tough it out").

Rings seem to be the kind of problem where our current solution is good enough.

I don't foresee computing power to be the same. We'll want more and more of it.

So stagnation will be due to gaps in basic research, not due lack of interest.