"Oh relax."
Please don't pretend to know my mental or emotional state from a matter-of-fact comment I made.
If you haven't heard of the weaknesses of ssh shared keys, then you probably haven't read much about Unix system security. It's a quite liberally discussed topic. If one machine on a network is compromised, then it's a network-wide problem. This is especially the case when using host keys rather than or in addition to user account keys. Guess which one OpenID is more like.
A trend does not a good idea make. There used to be paper dresses, and DDT used to be a popular pesticide. I think the classic parenting tip here is, "If Yahoo and Google jumped off a bridge, would you jump, too?"