That statement from the OP rubbed me the wrong way. Trusted services going down are a fact of life. It is going to happen. I agree Skype's last outage was three years ago which is a good track record compared to more traditional services that you might pay a lot more for. Other "trusted" services like electricity, water, heat, transportation fail from time to time even in the most modern of cities. The key is how a company responds to it, triages it, and communicates it to their customers (i.e. with frequent updates)
Hopefully, Skype provides a postmortem describing what happened and how they fixed it.