Yes, you are completely correct. If the power scales really rapidly and then reaches a cap while the stabilizer distance is still a reasonably short distance (like 100 meters), then yes, our predictions of doom will be moot. So too however will be the entire idea of stabilizers. I cannot imagine that the developers will go to the trouble of programming something like stabilizer distance if it is not meant to actually scale beyond a very short distance. They might as well not have stabilizers.Yes, hence "scaling distance".
But, we don't know how much space will be required, or how quickly the distance will scale. We also do not know how much power the new reactors put out per block, and how much or even if the amount of power scales with cluster size.
So if we don't know how many power blocks we need, we don't know how much space we need for any given amount of power, and we don't know the ratio of stabilizer to reactor blocks is, then we don't know how much room these new reactors will take.
Hence we cannot say that all stabilizers have to be at the opposite end of the ship and that the only viable build method will be stick/dumbell ships, because right now we don't know how big reactors will have to be to achieve a given result.
You seem to think that your PvP competitive ship will be competitive with a small set of reactor blocks and stabilisers put only a reasonable distance away. I am saying that a competitive PvP ship will have the largest set of power blocks they possibly can and that the required stabilizers will therefore need to be a long distance away. This is in fact what the developers have said (quoted in Arkudo's post above). Maximum power will require maximum distance, which will force maximum length. Somehow you cannot see this or see the consequence.