According to the OP's metric, Wittgenstein could be very influential and yet still be undervalued.

I kind of agree with OP here. Most people know of Wittgenstein as this impenetrable weirdo who stressed the importance of language to defining philosophical concepts, and then they move on from that. But if people really got what Wittgenstein was saying, it would bring a lot of philosophical debates to a screeching halt.

Sometimes I think of Wittgenstein as the guy who beat philosophy's final bosses.