Originally Posted by
Ragedaug
Here's the short of it. The only "thing" stopping you from running 25 mans, or as you say, forcing you to do 10 mans, is the lack of finding 24 other players who want to do 25 mans. If there were a lot of players who actually wanted to do 25 mans, they would. There's no in game limitation going from a 10 man group to a 25 man group, short of finding 15 more people.
So that said, now the only way for you to run 25 mans is to force players who do not want to run 25 man to play with you.
Start up a guild, advertise of various forums. List it in guild finder. Let everyone know you have a new 25 man raiding guild starting up. My guess is that even with the a 25 man raiding guild available, you won't get many bites. On the other hand, if this is such a terrible travesty in the game where tons of players want to run 25 mans but can't due to the lack of 25 man raiding guilds, you should see new members flock to your guild.