They should build an interface for raid only. and honestly this is the only place where a Meter of some sort will matter anyway. Dungeon dps fluctuates too much due to the inevitable absence of certain buff/debuff types to use as self improvement, and the unequal footing of each classes' current AoE capability for trash(dungeons are 90% trash...). Raid environment is the only type of content currently that require accountability on part of the DPS, as this is the only type of content that you can actually fail at succeeding due to the lack of DPS.
I don't want this to encourage the wrong crowd, like tank and healers being measured against each other for something that isn't their core job. I can write a very long paragraph about how badly the DPS expectation is for tanks and healers are around now, and I think this is largely due to the lack of accountability for DPS.
You know a tank fucked up when a boss isn't positioned correctly, or if he didn't use a cooldown at a time when he should. You know a healer fucked because, well dead people when they shouldn't be dead. You know your DPS isn't pulling their weight... well not really ever, until you hit enrage, and at that point it's still very unclear where the area of opportunities are. Often when this happen, we put more weight on tanks and healers, oh can you dps during this part, oh can you sword oath for non tank busters, oh can you str accessory (which is no longer an issue).
Yoshida said this many times, the savage encounters are balanced around 0 healer dps. I personally don't think it's rocket science when a group get stuck on a piece of content due to the lack of damage, the damage dealers should step up their game. But without proper tools to help with this, nobody would know how, or even know they're not pulling their weight. The new dummies is a step in the right direction, but is no where near a good measurement of how well someone would do in the actual Raid environment. Example of this: when a BLM enters SSS to probably have the best time of his/her life.... (lol).
I think this game could be and should be enjoyed in many different ways. If you're a Bard, you don't believe in WM and you come into my Expert Roulette and run the entire thing without it, it's okay as long as this is what you choose to do, it really isn't much different than the tank who never use and cooldowns, or the whm who never uses regen. Nothing wrong with being casual, it's a game not a job. But when running content that require appropriate level of class potential awareness and optimization, the player should consider what they have signed up for, and the game should provide us the tools to help us do it.