I agree with a couple of posts in this cheap wow gold thread that players tend to look at all the loot tables in the game, imagine that they have all of that loot, and then compare themselves to other players of equal gear. The reality is that very few players are ever in that situation of being unable to upgrade, and to be honest, the game starts to be a lot less fun when you do reach that point. The potential to improve your character is one of strongest motivators to keep playing WoW. (Source)

There was an orange bow and orange blades in BC. Did that mean that hunters and rogues lacking those weapons were uncompetitive? Not really. Did that mean the trend was to keep dropping better and better hunter and rogue gear compared to other characters? Not really. It is a useful tool to imagine gear that is several tiers higher than current itemization and estimate what characters will look like then -- we use it ourself. But remember that gear is not real gear. If resto druids fall behind when everyone has 10,000 spellpower, then we're not really going to lose sleep over it, because the game will have changed so much by the time that gear becomes reality. If they fall behind when everyone has 3000 spellpower, then maybe it's a problem (though we don't think it is the case that they do).