I raid lead 25s for 4 years until the Dragon Soul patch launched, so I may have a little more experience with the recruiting game than most of you. I was fully in support of the same gear for 25s and 10s at Cataclysm launch. The result, though, was that 25 man recruiting took it on the chin way more than anyone expected. The already difficult task of maintaining a 25 man raid roster became much more difficult.
I'm currently running 10 mans, not by choice, but because there are about 12 people that I met in my 25 man guild that I don't want to play without, and there is literally no way to get recruits excited about a guild just making the jump to 25s.
Don't think that everyone that is raiding 10 mans is doing so because they don't like 25 mans. There are, I'm sure, plenty of people that prefer 25s, but don't want to make the jump because it takes time to establish a 25 man raid group. It means asking your players to go through an extended period of worse raiding, to reach a period of great raiding, with a well-oiled 25 man raid.
This change, or at least the separation of raid locks, is needed to make the choice between 10 and 25 a truly free and fair one.