I love peoples interpretation of Diva as meaning big voices LOL
That's YOUR interpretation of a Diva. Madonna/Janet Jackson & JLO all would be considered Diva and they don't have big voices. It's not all about who can scream you out of a room - it's about career longevity, stage presence, attitude, fan following, accomplishments. I would love for them to spread out from just choosing people who wants to yell at you for 2 hours. Can we give others opportunities as well. You can't keep choosing ear piercing singers all the time...because you're going to run out of options (I.E Miley Cyrus announced for 2012 - yikes!).

I would love to see:
Janet (if she's up for it, just having a baby at 50 and all...)
Madonna,
JLo,
Pink,
Adele,
Beyonce
Dolly Parton
to name a few!

Let's go with a more "performance" based show - watching singer after singer just stand in one spot yelling for 2 and a half hours is a bit taxing. Let's mix it up...that's why the show begin to fail in the first place.