The solution isn't to just increase the proportion of spots that are available for DPS queuing otherwise you will always be running into the problem of making everything larger to accommodate for all the DPS players and there will be no end to it within any reasonable limit. You will soon see 8 man dungeons that aren't raids to try and fit 6 dps per tank and healer in order to shorten queue times and hinder FC's that run together or raiding groups that run content together as the distribution for them wouldn't be the same as those that are required for raids have the 2/2/4 requirement and unable to slot in to 1/1/6 to have the same effect.

The solution has been said a million times which is to either level up a tank and queue for your tomes or run with your FC as the dungeon requirements scale well for the raids being 1/1/2 into being 2/2/4 when you start raiding. It also takes you out of the bottleneck of the duty finder which tries to pair you amongst all the other dps classes