Lately, I've been reading the forums and discussions about the proposed changes to raiding. It seems to me that there is a significant--and vocal--segment of raiders who lack faith in 25-man raiding as a fun and attractive activity.
Basically, their arguments are that Blizzard should continue with 25-man raiding because 25-man raiders are somehow the most deserving of WoW players. All other activities must have significantly lower rewards so that people who wish to progress have no choice other than 25-mans.
It seems that deep down, in their heart of hearts, they fear that most people do not like raiding. That other people just raid for gear. And since they like raiding, they try to promote raiding by loudly denigrating all other choices, and seek to have Blizzard stack the deck in favour of raiding. Basically, they seem to think that if raiding had to compete with other activities on a level playing field, it would lose out.
This lack of faith hurts the raiding cause far more than it helps. Blizzard should not make 25-man raids because 25-man raiders are somehow "more deserving". Blizzard should make 25-man raids because raiding is fun, and a large portion of the audience enjoys it! Blizzard should make more battlegrounds because battlegrounds are fun! Blizzard should make more 5-mans, because dungeons are fun! Blizzard should make more reputation grinds, because grinding rep is...wait, no, no it isn't.
The raiding community--especially the high end--does a really poor job conveying the fact that raiding is fun to non-raiders. We do a lot of complaining, of calling people "bads", of indulging ourselves in trying to prove we are better than "casuals". But these types of behavior hurt raiding far more than they help.
Imagine you are a new 70, thinking about raiding. You take a look at the Raid & Dungeons forums on the WoW forums. Do you honestly want to end up in guild with people like that? Or your realm forums. I'm sure you've seen a newish guild post about their latest triumph, and get torn to shreds by some high-end raider sneering, "Months behind". Can raiding really be fun if raiders act like this?
The thing is that raiding is fun. Working together as a team to kill a dragon is a thrill. Watching a raid move through the complex dance that is a boss fight is an experience. Even wiping is fun (to a degree) as you slowly get better and better, as you get closer and closer to victory. Raiding is more than capable of holding its own against the other options in this game.
The problem with raiding is getting new people to try it, trying to convey to new people that yes, this is worth doing, that raiding is fun in and of itself, and the loot is just icing on the cake. If we raiders want Blizzard to keep making 25-man raids, the best path is to get more people raiding.
This is why the 10-man raid progression is worth having. The single largest barrier to getting new people raiding is not gear or skill. Gear improves with time, and skills can be learned and taught. The major barrier is time. It is getting people used to the idea of blocking out one or two evenings a week for WoW. Getting someone to say, "I raid on Thursdays" is 95% of the battle of creating a new raider. 10-man raids will do this, will allow people to become raiders in the safety and comfort of a small guild. From there, it's just a small step to the 25-mans. 10-mans also offer a safety net, so that if 25-mans don't work out, you still have options to progress, to see new content.
People will raid if they believe that raiding is fun. Emphasising that raiding is an enjoyable activity, and nurturing and being helpful to the new raiding guilds, will do far more for the cause of 25-man raids than trying to argue that raiders are somehow "more deserving" of Blizzard's time than other players.