No. Alcohol and drugs are with us from the beginning of history, are very much ingrained in human society and culture, and support trillion dollar worldwide industries.
In-game trading virtual goods is a niche novelty activity, and trading them for real money even more so. You can get the same satisfaction out of the game trading them with token money.
>It will push the activity to go underground.
Games cannot really go "underground" though. They are sold in stores or accessed online and depend on massive communities of millions of players. It's not like Sims of Farville can go underground suddenly.
Nor are they as essential and addicting as alcohol/drugs.