By the way, the USSC failed to eliminate the waiting period when they took the case. Which raises serious doubts about your claim that it is unconstitutional.
I'm not sure whether you are referring to the old, now-non-existent, waiting period, or whether you are still trying to refer to the current system as a waiting period.
I'll assume that you are referring to a challenge of the old, now-non-existent, waiting period.
Note that at the time that was in effect, the US Supreme Court was not upholding the Second Amendment, and was freely allowing the government to flagrantly violate it.
Note that now the Supreme Court is upholding the Second Amendment, and is no longer allowing the government to flagrantly violate it.
And no. I presented a very compelling case on two fronts as to why needless waiting periods are unconstitutional. There is no possible argument that could successfully counter either of those arguments.