Re: I agree
It isn't as though the airlines are asking everyone to submit their phone for inspection at the gate, so they can see if you have a Note 7 and tell you that you can't use it on the flight. There's nothing to be gained by Samsung making a distinction between the old one and the new one - whatever they added to the "fixed" version to show it was fixed would just act as a scarlet letter reminding people of the fiasco for years to come.
They just need to make sure they are all replaced, even if it means pushing updates to the unfixed ones that informs their owners that they will stop working after date X and they will need to contact Samsung to have it replaced. The worse thing that can happen from their perspective if for reports of fires to continue for months, due to stubborn owners who assume it'll never happen to them and don't want to hassle with replacement.