We don't need to distinguish between entities. We only need to allow them to exist. That's all.
If there is no way to distinguish between them then everyone can just tell the miners that they want to use the free alternative.
I already told you that there will be services that will be willing to pay some sort of fees for various reasons. If your only argument is that everyone will want to use the free alternative then I think we are done here. I don't have the time or the crayons to explain it to you.
So you already know that 12 BTC + whatever fees will not be enough. Ok. Please tell me what will the exchange rate be in 2 years. Oh wait you don't know shit.
And neither do you.
Well I never claimed that I do, but I am not trying to push things on what I think it will happen or not like you are trying to do. I just want Bitcoin to have endless possibilities for everyone, not only for those willing to pay a higher fee.