Google and Facebook aren't buying off-the-shelf servers in bulk, they're rolling their own. Facebook, and others, are open-sourcing their designs.

The "automobile" here is being able to source systems like that without having to pay a premium for Dell or HP.

And if that trend becomes wide spread there will be vendors that will spring up providing those servers. Most businesses can't afford the expense of designing and creating their own server lines. I just don't see the generic server hardware going away soon, more specialized boards and designs may pop up but nothing stops vendors from providing them.

Also there's a lot of money in the support of the servers sold.