The only reason why I ever wanted AT&T to jump on releasing an official 7.1 is due to the fact that, according to my talks with AT&T, mobile hotspot is not supported on the Bold 9900 since it's a 7.1 only feature, and AT&T doesn't support this feature on their end.
I am running 7.1.267 and already have the DataPro 5GB tethering plan, but they are still blocking me from their side (says Mobile Hotspot Activation required, though I ALREADY have the plan and tethering is active on my account).
So, my BB was perfect except I had no wireless tethering, and USB cable tethering didn't work either. This was becoming a big problem since I need this function for work, as I often do business in environments with no WIFI access. Additionally, I didn't want to buy a MiFI puck or USB stick since it would be just another device to carry around (and another monthly data bill - I pay enough with AT&T!).
So anyway, long story short, I stumbled upon tether.com from these forums and it works like a charm (except it's really slow for some reason....but it works, and is reliable). Now that I have bluetooth tethering, I don't care about AT&T getting their act together since I'm running the ultra-stable 7.1.267.
I do know one thing, though. AT&T's lack of service for BB users as far as OS support has been dismal throughout history. When my AT&T contract is up I am strongly considering switching to a more BB-friendly company, such as Verizon or Tmobile.