One week after dual specs introduced...

Let me summon up my own time travelling phone booth, a la Bill and Ted, and us both throw some sunglasses on as we travel into the future. Our destination is one week after Dual specs are introduced.

We go to play World of Warcraft. Taking a look at our LFG screen for Heroics, we see several Paladins waiting for Heroics. After finding members of a few other DPS classes, and finally a healer, we message each of these Paladins, one after the other, asking if they are willing to tank for us. With minor individual variations, each conversation goes roughly as follows.

Me:- "Hello, would you be willing to tank <Heroic> for us?"

Paladin:- "Sorry. I'm Ret."

Me:- "What's your other spec?"

Paladin:- "Ret."

Me:- "WTF? How does that work? How do you have two specs from the same tree?"

Paladin:- "Well you see, I have my PvP Ret spec, and my PvE Ret spec. I'm still Ret, but I have a couple of points moved around slightly to make each a little easier."

Me:- *Hyperventilating; possibly at risk of stroke* "#$%@&#(!!!"

Dual speccing is not going to cure the tank shortage. With any class capable of tanking, the above scenario is, in 99% of cases, the only thing it will cause.

People don't tank because people are selfish, not because they can't respec. Up until now, respeccing has just been a convenient excuse, however once dual speccing is brought out, they'll simply come up with another one.