Just like the people who think that they game has gone down the shitter since ten man raiding was introduced have no data to prove that the game would be better off without ten man raiding.You have no data at all to support this claim, so I'd be careful if I were you.
And the result of that experiment is that the playerbase in general prefers 10 man raiding, and that people that like 25 man raiding want extra stuff because they are special.The only thing you actually can do, is release an Idea, let it run for 2-4 years and look at the results.
Look, I raided MC, BWL and AQ40 back in Classic, and 25 mans until Cataclysm came out. I've done my share of raiding 20+ hours a week in 25 man raids. At the end of Wrath, we decided to do ten man raiding. I don't really look back at 25 man raiding with nostalgia, it was fun - sure. But not fun enough to warrant the stress of being a raid leader (and I'm the kind of guy that gets made an officer), and I don't think that extra items would do anything to make me want to go back to that.