Recently i started looking at some wow patch notes from vanilla, and in patch 1.3 they change the player cap of the dungeons from unlimited to the following :
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"Dungeon Player Caps Edit
All dungeons now have a cap on group size to limit the number of players that may enter the dungeon. It was necessary to add this cap as raiding these dungeons trivialized much of the content. Because of this change we can now look to adding better loot to them during future content patches.
With that in mind, the dungeons below now have the following caps:
Onyxia/Molten Core - 40 members
Blackrock Spire - 15 members
Diremaul - 5 members
All other dungeons in the game will be capped at 10 members.Several dungeons will be re-examined for balancing in light of this change. In addition, will have their loot improved significantly for the next content patch."
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and many respawn timer in dungeons were also changed (http://wowwiki.wikia.com/wiki/Patch_1.3.0 )
In the next patches blizz did a series of changes to dungeons and raids in loot and some mechanics notably in patch 1.4 (http://wowwiki.wikia.com/wiki/Patch_1.4.0), and patch 1.6 adjusted scholo and strat to be more suitable for a 5 man group (http://wowwiki.wikia.com/wiki/Patch_1.6.0).
Finally in patch 1.10 blizzard changed the cap on the high level dungeons to 5 and 10 players to preserve the challenge of these dungeons (http://wowwiki.wikia.com/wiki/Patch_1.10.0)
What I'm suggesting is implementing the dungeons before all nerfs and changes were made to them in the 1.4 and after patches, this way all dungeons would have a player limit of 10 or 8, and ubrs a limit of 15, I don't know if these changes are possible to make because there is no specific or detailed info on what they changed during the patches after 1.3 was implemented, but the idea of reverting the difficulty of all these dungeons to it's original one seems like a good one.
Again i don't know if it's possible or even if the community would like this, but Nost already did something similar with the way gear was "time locked" and was implemented has the game progressed trough the patches, so why not do the same with the dungeons.
