For what it's worth, there is some reasonable motivation to not have a tank in T9 tanking ICC: Because tank threat needs to exceed DPS damage in order to stay on top, bringing an undergeared tank with overgeared DPS is asking for trouble. Under-geared DPS will cause a wipe far less often than under-geared tanks (or healers, but people seem to think about that less for some reason). Since tank threat doesn't scale linearly with DPS increases, the buff may actually exacerbate threat problems in some cases.

It's sucky, but I've definitely run into it on the tank alt that hit 80 about 5-6 weeks ago. I've been able to get past it now -- getting the character to a 5K GS made a big difference. (Technically, this should mean that I have some ICC gear/experience. In reality, it means that I got the crafted boots, 264 gloves, and got lucky on a tier 264 drop from VoA.) I'm a reasonably competent tank who knew the ICC fights well, and tanking even a 10-man with a 5k GS gave me a fair amount of trouble with DPS pulling off of me, because I just didn't have any buttons to generate more threat. (Deathwhisper is a primary problem -- gathering the adds up with overeager DPS is a real bitch.)

My first two runs I got in by explicitly saying "Lower Spire only, alts preferred." The runs sucked and took a long time, but I got my Lower Spire achievement, and that made a huge difference in future pugging.

Last night, I was able to take the spot of one of our unavailable guild tanks and took us through the Blood Wing without a single tank-death-based-wipe. (Well, except forgetting to put on my shirt on gunship.)

So yes, it sucks. It's also not entirely unreasonable from the perspective of a PUGing raid leader. The fix is probably to lead an ICC yourself, preferably with a friend of the same role who has done it before, so you can be off-tank. Once you have a 5k GS and a Lower Spire achievement, at least on my server, you're in much better shape than otherwise.