Square, please make dungeons 5 players.

[Kotemon]

This was photo was taken from the offical 2016 Eorzean census showing that over half the players of FFXIV play DPS mains.
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The problem I have is that 1% of the game population is missing. That pie adds up to 99%, so unless the 1% are to good for any of the 3 jobs. It doesn't look right. The ideal ratio should be 50% DPS, 25% Tank, 25% Healer. That would break down to the exact ratio of a group of 4 people in a dungeon. If they need to add more people to a light party the percentage has to break down evenly. Even then it wouldn't solve the problem of folks not doing PUG in duty finder on certain jobs if there is no motivation to do so.

[dynus]

The problem I have is that 1% of the game population is missing. That pie adds up to 99%, so unless the 1% are too good for any of the 3 jobs. It doesn't look right. The ideal ratio should be 50% DPS, 25% Tank, 25% Healer. That would break down to the exact ratio of a group of 4 people in a dungeon. If they need to add more people to a light party the percentage has to break down evenly. Even then it wouldn't solve the problem of folks not doing PUG in duty finder on certain jobs if there is no motivation to do so.

Pie charts like this hardly ever add up to 100%. What probably happened was they rounded to the nearest whole number, instead of giving a number with a decimal. If everything was split evenly into thirds (33%) you'd still come up with 99% because one-third is actually 33.3333333333333333333 into infinity.

Honestly, I don't think upping the party to five in dungeons is the answer. I think splitting the DPS role is. Instead of being 1 tank, 1 healer, and 2 DPS (or 2, 2, 4 in trials and non-alliance raids) it should be 1 tank, 1 healer, 1 melee, and 1 ranged/caster. (and 2, 2, 2, and 2 for trials and the other stuff). I think that would ease up the queue better for 2.x-current content.

[Zojha]

I think splitting the DPS role is.

And how do you think that is going to help the queues? You still have the exact same amount of DPS waiting for a tank/healer. Until these tanks/healers queue up, nothing can move and no groups can be made. You literally only make the situation worse for the more popular kind of DPS, as you halve the amount of slots available to them. The other kind of DPS is still going to wait just as long as now for a healer/tank.

The only solution here is to allow more DPS per tank/healer, because those roles are the bottleneck that prevents groups from being made. Without that bottleneck, queues even for DPS can well be instant, as PotD proves.
Alternately, you gotta make people play more tanks/healers... but good luck with that. Either way, you need to address the bottleneck if you want a better flow.

[Shurrikhan]

Honestly, I don't think upping the party to five in dungeons is the answer. I think splitting the DPS role is. Instead of being 1 tank, 1 healer, and 2 DPS (or 2, 2, 4 in trials and non-alliance raids) it should be 1 tank, 1 healer, 1 melee, and 1 ranged/caster. (and 2, 2, 2, and 2 for trials and the other stuff). I think that would ease up the queue better for 2.x-current content.

How would that not make the issue worse, if anything?...

On topic:

As Zohja said, reducing the bottleneck allows for faster queues; simple as that. That can be done by increasing the proportion of people interested in tanking (and to lesser extent, healing), or by adjusting the compositions to what's there. Personally, I'd just as much like to be able to see 3 DPS and 1 tank or healer comps as 1/3/1 comps in dungeons. Sadly, SE has gone out of their way to ensure that such things are impossible by stripping the game of most CC as of level 50.

To me, the key is compositional scaling. Want to keep 2 healers busy alongside 1 tank and 2 DPS? So be it. There's now more damage. Want to roll tankless? Alright, better be on the ball with CC, kiting, threat swaps, focus targeting, and environmental damage.