Queuing as a DPS had a lengthy waiting time to begin with, and the changes to tanks and healers caused many players that mained these roles to either change to play DPS classes/quit the game until rebalances happen in 4.05. Red Mage is also a very popular job that has people playing it to level it up. The main reason the queues have increased for DPS is a combination of the new DPS classes and people quitting tanking or healing as they're unhappy with their respective skill changes, not Samurai alone.

Once 4.05 hits odds are that, if Squeenix addresses the main issues people are having with the current tanks, we'll see relatively shorter queues. Plus odds are Red Mage and Samurai will get nerfed into oblivion at one point or another or that people will just get tired of the shiny new jobs and go back to playing other classes and roles.