1) You're going to bring that rogue if he's #1 in the world and drop your lowest performing dps'er...so no, you're wrong there. Also, point to me where you have a single fight anywhere in recent WoW that requires more than two tanks (in a ten man), that would require you to bring a DPS/Tank hybrid over and above your normal tanks for the instance run? 2) You're probably not going to have to have people respec very much in this game is the point, and you should always have a second fulltime tank either in the raid or ready to be. 3) Evidence just DOES NOT support your rather ridiculous claims. Pure DPS classes ARE NOT being phased out or asked to sit in favor of classes with multiple roles despite similar DPS ceilings, it's just not occurring. So unless you can demonstrate that it in fact is, you're completely wrong. But I'll save you the trouble...it's not. NEXT PLEASE...

You're going to bring the best player...regardless of class or spec, which is entirely the point. Not to mention this is even less of an issue, and it's not one in WoW, here...since there IS NO Dual Speccing option and changing your talents costs a not insignificant amount of credits to be doing it all the time. Bottom line...actual raids in WoW do not do what you are claiming. And actual data and evidence does not support your claim either. You are wrong. Next please...

Proven definitively wrong by WoW...next please.

Naus is dead wrong. A Tank specced Guardian WILL NOT do the same DPS as a Sentinel, only a DPS specced Guardian will...which is fine and solid game design. If your argument is that there should be some sort of retarded "hybrid tax" just because a Guardian CAN spec tank and a Sentinel can't well then you are wrong and have been proven so definitively by WoW. This is even more relevant in this game due to there being no Dual Speccing option. The statement "there is no reason to roll a pure DPS class without a tax on hybrid specs" has been shown to be demonstrably FALSE. All you need do is look at WoW, where Mages and Rogues are being played all the time and doing very well despite there being no hybrid tax at all. So yeah...try again.