Well that's certainly not true. About the only team that would be involved with the dragons would be the Art and Animation people, with some input from the AI team. Why would someone working on the interface, or quest design, have to stop what they were doing in order to work on dragons? They're just another creature that will populate the game. Do you think that Oblivion lost out on something just because they decided to create a Nether Lich to battle you, or Spider Daedra? Your reasoning just doesn't make any sense.
Ok people lets get open minded here. If there is a quest in the game related to dragons, that took away from another possibly better well thought out quest. How about dungeons that have to be big enough to accommodate dragons. How about all of the dialogue written and recorded related to dragons. How about an all new system called dragon shouts that involve going to different places and discovering words for the shout, or the gameplay side of actually using the shout. I know you are aware that the shouts does different things like slow down time, which has to be incorporated and balanced in the game. How about the scripting of dragons attacking towns, or the Npc AI reactions to the attack from the dragon. I'm sure the list goes on and on. I'm not talking directly about the dragons, I'm talking about all of the content in the game that has to do with dragons.