He is not saying
> See I found a few people who do run servers, therefore your argument is invalid.
His point is:
> It is correct that only a tiny percentage of people do run servers. But it is exactly this tiny percentage who make certain projects successful.
He then generalizes this observation. To paraphrase: "People don't want to run their own servers" is similar to "People don't want to write their online encylopedia" - true, but not the defining point.
In a sense this article doesn't say that the argument "people don't want to run their own servers" is wrong, but that it is the wrong argument.