Yes the patch is today, but even though it's nostalgic at this point I will comment to the OP.
Yes you can tank infernals. We successfully downed mag with only one lock, and no rogues/dps warriors/shaman for interrupts. Granted we are working on Kael/Vashj, but it is possibly.
I tanked the infernals and had a couple other tanks help me round them up. We also brought 9 healers in there because that's what we had on at the time. I could hold as many infernals as they could bring me, just keep them away from the group, the AOE blast wave they do is nasty to anyone but a tank.
Given this, it was still rough. For a progressing guild in there it would be near impossible to do without the locks/hunters. That's probably why they are changing it, lol.
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WotLK... birth of THUNDERJUDGE! and BUBBLEWALL!!