The thing is with no dual spec and exponential increases in respec costs (which hopefully they won't have in the live version), all the fights either need to be 1 tank or 2 tank. Tank specs are bad dps so you can't really switch fights back and forth between 1 or 2 tanks without requiring raids to boot one of their tanks half the time. A lot of the fights in WoW made 2 tanks a necessity through pretty lame gimmicks, so at least in 8 mans I hope TOR sticks with 1 tank.