I think it would make more sense to state that generally.
'A Free, Open Source, feature rich, easily set up publishing platform is the greatest thing that ever happened to the internet'.
But, isn't that basically what the internet was created for? So it sounds a bit like 'The internet is the greatest thing that ever happened to the internet'. If it wasn't WordPress fulfilling this role, I could easily see another product doing the same thing.
To clarify, I mean: I agree that the emergence of an open source, free and libre content management system based on a similarly open programming language, operating system and server environment is a fantastic thing for society. It didn't have to be WordPress specifically, that's all, because WordPress is not perfect or unique. It merely fills that role well.
'A Free, Open Source, feature rich, easily set up publishing platform is the greatest thing that ever happened to the internet'.
But, isn't that basically what the internet was created for? So it sounds a bit like 'The internet is the greatest thing that ever happened to the internet'. If it wasn't WordPress fulfilling this role, I could easily see another product doing the same thing.