I'm not sure whose argument you are attempting to take to a 'natural conclusion' but it wasn't mine. So again, are you being purposely dense or is this your natural state?
Of course there are legal sellers of alcoholic beverages now, because alcohol is legal. But do you think those who were bootleggers kept selling alcohol after prohibition was repealed, or do you think they took up some other criminal activity?
The latter makes more sense. I've never seen anything to support the former. If you have some solid proof, feel free to present it.
Oh, sure it was. Your statement was "So legalize drugs and the guys who sell them will suddenly become law-abiding citizens? Riiiiiiiight." This was in response to someone else's statement "Legalize drugs and you will defund the gangs." But this is true. We legalized alcohol, and all the criminal gangs of Prohibition faded away.
We tend to have a view of Prohibition as kind of a time of charismatic gangsters in their dapper suits, but these were in fact vicious criminals who gunned down competitors and innocents alike. Why were they able to do this? Because they were flush with cash from supplying a demand. We removed the black market, and thus removed their funding, and drive-by shootings became a thing of the past... until the War on Drugs really got into high gear in the mid-70s and we doomed ourselves to repeat the unremembered past.
Will the individual drug dealers become law-abiding citizens? Perhaps, perhaps not. Realize that many of them became criminals because of the powerful incentive of huge black-market profits. But regardless of how many of them remain criminals, it's dead certain that the powerful drug-running gangs they belong to will lose their source of income, and that can only be a good thing.