I trawled through the guild recruitment forums to see if this was actually part of a wider trend, but don't know what to think. The 25-man raiding guilds are the most likely to say they use a DKP system or variant; 10-man raiding guilds nearly all use loot councils, at least from my (admittedly brief) survey of the current advertisements.
Is this also happening on your realms, or have I gotten this wrong? We all know that every DKP system has its issues and that administrating them is one of the larger headaches for guild leaders. 10-man raiding is also more popular than 25-man raiding right now, and it probably doesn't make sense for a guild to obsessively track DKP for a 10-man where most players probably aren't rolling on the same stuff. Is DKP dying, or is it just a sign of the popularity of the 10-man model?