25 mans need to go.

Q u o t e:
Large raids are a thing of the past. 10 man raids have proven to be dramatically more successful.

Let the idea of large scale raiding die off peacefully. IMO, smaller more close knit groups are much more epic feeling when you down a boss.

While I personally get a more epic feeling from the 25 person dungeons, the 10 person dungeons are still a lot of fun because, like you said, it's a nice tight group of people taking on the place. We plan to continue making dungeons for both the 10 person model and the 25 person model as both have had a great deal of success.

Q u o t e:
10 mans are better in every way and are much more accessible to all players.

This comes down to your preference and style of play really. But like I originally said, we plan to continue making both of them to keep raiders happy, but we don't currently plan to bring back the 40 person raid model.