I personally, feel that trials (even if only EX) are challenging enough for a player group to be counted as a raid, and of course all the turns of all coils and the towers. For example in WoW's current raid (Blackrock Foundary), one could very well have cleared all the trash mobs in Flamebender's forge area, then turned left and gone directly to Kromog. No trash in the way at all - just a boss to a boss, so we can't discredit turns in coil that are bosses only, as was mentioned.
I'd probably prefer the 4-6 months timeframe, with smaller chunks of content rather than a huge raid and then nothing.
That's the unfortunate thing with WoW atm for me, is that I've finished Blackrock on Normal and nearly on Heroic. Our guild is nowhere large enough to even contemplate doing Mythic, and those hard lock you to the group ID you're with ala how coil used to be, which thus leaves me having to pug it. But now that the leveling from 90-100 is done, it's Blackrock or oh wait, that's it.
