I am in a guild that is suffering mightily to stay 25-man. We have a very solid group of about 20-23 raiders. The 4-5 "bad seeds" that hold us back on fights like Elegon, added to attendance issues, added to other various factors...are making 25-mans a seriously lost cause. If there was incentives to get, say, a decent 10-man guild to merge with us to do 25's, we'd be peachy keen. But what incentives are there to do so?
I understand that people think there shouldn't be a difference between the two, but at the same time people need to understand that there does actually need to be one to keep the format viable beyond the top guilds in the world. Because beyond those top guilds, 25-man guilds may as well be extinct. They're certainly on the verge of it right now, and it's really saddening to see it end up this way. I raid for social experience and fun. The less people around me, the less fun I'm generally having. For people in 25-man raiding guilds to actually enjoy themselves, there sadly need to be an incentive for people in 10-man guilds to do 25-mans.