I think that's a horrible idea. You can't punish all the divas just because the majority of them need more improving. The people (including me) who actually like the divas and defend them even if many of them aren't very good would hate to see all the divas on ECW, where you'd probably get an average of many 2 divas matches a month. Here's where I think all the divas should end up...
Alicia Fox: I think she was fine on Smackdown. She was really improving by learning from Michelle McCool. Though, she is also improving on Raw, Smackdown is a much better suit for her.
Beth Phoenix: She is perfect for Raw. However, since the Divas Championship is on Raw, some may agree that Smackdown is the better place for her. Competing for the Divas Championship and not winning it is not a bad thing at all.
Gail Kim: I never understood why she was traded back to Raw. She wasn't booked good on Raw in her first stint, and isn't doing it now. Attempting to make a name for herself on Smackdown before going to Raw would have been great. She's one of the best female wrestlers, but you'd never know it.
Jillian: Smackdown is the best place for her. She is very talented (I think), but Raw never worked for her. On Smackdown, she can showcase her talents a lot more.
Kelly Kelly: I'd put her back to her roots on ECW. She's improving all the time, but I still don't consider her a serious threat to any title. Her athleticism is wonderful, but I just can't see her as a title contender.
Maryse: Here is someone who could flourish on Smackdown and Raw. Not just because of her ring skills, but because of the character, her gimmick, and the fact that she gets a lot of attention from the WWE Universe. (Not to mention her looks). That would help her succeed on either brand.
Mickie James: Just like Maryse, Mickie James could succeed on either of the major brands. However, Raw has been her home since the start, 4 years ago and she's been very good at staying at the top of the divison, whether she's champ or not. She'd do just as good on Smackdown.
Rosa Mendes: I'm upset that WWE doesn't let her show her talents. I know she's a great fighter, but WWE does a horrible job of letting you know that. So, I'd put her on ECW until she shows her skills and then she can go back to one of the other brands.
Eve: Smackdown... great for her. That is all!
Layla: Smackdown is the best place for Layla. She is very underrated, in my opinion and really needs to gain more attention from the audience. There's a reason why she's usually featured in many of the diva matches on Smackdown. She doesn't need the title, just the air time.
Maria: I am very upset that WWE has taken Maria away from the ring. When she was first drafted to Smackdown last year, I was really starting to look at Maria as a future champion. Now... I have absolutely no idea if she's improving or not. I'd say keep her on Smackdown, build up her ring skills more, and then she can go back to Raw.
Melina: Melina falls in the same category as Mickie James and Maryse. She can be at the top of Raw and Smackdown. She got her start on Smackdown, began wrestling on Raw and won all her titles there, and now she's Smackdown's 2nd diva (in WWE terms, of course).
Michelle McCool: Same as Maryse, Mickie James, and Melina. McCool has stayed on Smackdown since the start and has gained a lot of credibility. I don't think she'd get lost on the Raw roster, so she could be on either brand.
Natalya: Natalya is in a league of her own. She's the only diva I think can flourish on all 3 brands. WWE still hasn't showcased Natalya's talents a lot, but we all know how good she is. On ECW, she could go through any other diva on the roster, on Smackdown (if given the chance) she could be put in the same category as Trish Stratus, Lita, Sable, and Chyna. On Raw (see Smackdown).
The Bella Twins: WWE made the right choice in putting The Bella Twins on ECW. You don't know who the best wrestler is. One twin starts the match, gets messed up, goes under the ring, the other twin comes in and wins the match. It gets boring, and you don't know who's the talented one (if either). If WWE doesn't plan to seperate them and let them go their own ways, ECW is the better place for them.
Katie Lea Burchill: PLEASE PUT HER ON SMACKDOWN! She is just a beautiful performer... very underrated, I might add. If she is put on Smackdown and gets some ring time every once in a while, she could gain so much more credibility. A title reign wouldn't be a bad idea either.
With that... I only see 4 divas who should be on ECW. They are Kelly Kelly, Rosa Mendes, and The Bella Twins. Putting all the divas on ECW would be such a bad business decision. You can't punish Mickie James, Natalya, Beth Phoenix, Gail Kim, and the other good divas and put them on ECW, just because some of the others aren't performing on their level.