Of course there is a saturation point.demand dies off unless the price point can come down, there is always saturation at every price point. It's unlikely the PS5 will ever shrink or be cheap enough to catch up to the times of PS2 where node drops were sizeable differences that reflected heavily on the price.
But here there are signs that the saturation point might be higher as evident by the above since it shows higher demand than the slimmer and cheaper PS4 at a times where the economy is at a much worse state.