If you're new you can easily get someone who has played more to be able to help you out. If you wish to gear up an alt you'd most definitely be able to get friends. The point of the system is that depending on how good you are you may not have to work through every dungeon, you may only need to do every second or third even. It may be harder to get a group - but then again getting groups while leveling in WoW doesn't take long, not reason it should be longer than that. It would also bring people who mostly play solo (ie crafters/questers/explorers/gatherers) and they'll do the odd dungeon, slowly getting better gear too. Then there would be pvpers who would pve occasionally. The limited people playing the dungeons isn't that big of a problem in my eyes. Working your way up the tiers while it could be annoying it also allows many more players to experience content at their level - they can choose to go for something harder or easier and it'll change how quickly they gather their gear. Also with the weekly rewards bonuses they could have that for every dungeon and raid, so that every player can have an opportunity to get better gear, meaning that players that join the game latter than others will be able to progress faster if there are less people playing in the tiers that they are in. Of course this also greatly depends on how that system is implemented - since we haven't heard that much news about it either.