You need to have people offering something of value in exchange for bitcoin... and those people will do it is they expect to get something of value in turn. Gambling and piramide junk are just spam that are keeping real economy from actually happening.
Us dollars, Euros, etc. aren't something of value in return? They are. All that trading for USD
is the real economy. It doesn't need to be trades for drugs, porn, or socks to be real economic activity.