I'm a tea drinker as well, but in my experience, even when they were going full-on Numi, they were usually out of the black teas by mid-morning, and sometimes earlier (implying that they did not re-stock every day). In CLE and other out-stations, the UC usually had a full selection. Hubs, especially C-concourse ORD, rarely... (Honestly, I don't think I've EVER been able to find a Numi breakfast tea in that club. It's been Lipton or nothing, for as long as I can remember.)

I realize that caffeinated beverages ought to be a pretty basic inclusion in the UCs, but I don't function w/o my morning tea, and availability has been so unreliable for the last ~year, I'd just started travelling with my own teabags.