When we talk about "Metalheads who went into GREATER things", the above examples cannot count, i.e. musicians who succeeded in metal. Sure, later on they did some undeniably cool stuff while inserting themselves into the world. But their greatest contributions were strictly cultural.
The examples truest to this post's heading should be metal *fans* who went into influencing society in significative ways. But if we search for them, we could hardly meet success.
Yet I think in 10-15 years' time we should be able to see how well metalheads - those influenced by the ideology of the ANUS - fared on the world. On this forum I daily see, for example, some pretty bright people. They are somewhat confused, though, and they just need time to polish themselves.