[Tails-dev] Does Tails' Connectivity Depend On One OpenDNS s…

According to /etc/ttdnsd.conf:

# OpenDNS
208.67.222.222

Does this mean if that IP goes down, the shit hits the
fan for Tails users and they won't be able to load
clear-net sites? Could there be some other future
unforeseen error/event occur where we really should have
been using not only one OpenDNS IP, but perhaps some
from another provider, MAYBE Google, but probably and most
preferably others like CCC?

I'm also concerned about tracking. Couldn't people who
run exit nodes sign up for an OpenDNS account(s) and
track the [Tails] users and/or compile detailed reports on
usage stats? Couldn't they also control/limit the sites
Tails users visit according to settings on their registered
OpenDNS accounts?