To those saying queue times will even out...

[Jetstream_Fox]

The logic that Yoshi is using is:

Introducing a new tank and healer did not dramatically change the total population percentages of those roles. In fact the change was so small as to be considered negligible iirc. That said, introducing new dps will not dramatically change the total population percentages of that role. We'll see if it's a good hunch to follow in the coming months.

But the difference between 3.0 and 4.0 is stated right in the beginning of the sentence. Each class was represented equally, which is why the drop wasn't as huge, and the added fact the classes were open at the start of 3.0, also helped keep the numbers low as people wanted to do 3.0 content and not continue with 2.0 content.

NIN impacted the queues in an entirely different way, with it's release being in the middle/end of 2.0, it was the new thing to do at time there wasn't really anything to do. So we can't really compare NIN in 2.0 with 3.0. Just like 4.0 won't be able to be comparable with past class releases.