It's true enough that Blizzard is working on the Paladin's tanking ability, but they still aren't Warriors. The example you provided for trash tanking is true enough, but you gotta remember: in most cases (especially bosses) if you bubble and loose aggro, people are going to die. I'm not going to argue the fact that Paladins have the ability to tank, I played one in fact and OT'ed in MC and BWL quite often, but even if their snap aggro is going to be higher, their sustained aggro is still far more difficult to keep going due to their less renewable source of their aggro, mana. In BC they do get that nifty ability to get mana back when they are healed, but I'm still sceptical as to how effective of a tool that is going to be in a long battle. I'll love the day that we see Paladin's become true MT's, but I doubt that will happen just from the abilities and talents they are gaining in BC. Much more viable OT's, yes. MT's...maybe...with the right player, and the right gear.

When we are low on warriors in the 40-mans the paladins like me step in. Garr's minions, trash mobs throughout MC, Golemagg's hounds, the goblin dynamite chuckers in BWL, the welps in the Supression Room in BWL... there are countless other places where paladin tanks step in on 40-mans. And if there is ANY role that we would NOT be good at it's a little bit of DPS. Paladins are meant to be survivors... and that is also the property of a good tank.

You want a challenge? Try making a paladin tank toon, because right now you are in easy-mode.