I'm consistantly amazed at how many of the same warlocks are distracted by the shiny new thing on the horizon, then quickly return to talking about how terrible the class is. You seem to have a lot of faith that this new mystery talent is going to be completely better than effigy. I'm not a pessimist when it comes to blizzard, I've played the game since vanilla, and played a warlock in that time. I just much rather would see something new take the place of something like Phantom Singularity which nobody is using remotely like regularly then replacing something that while not perfect, is effective as it is with just a little more effort. Right now Affliction has 'tiers' of difficulty and skill and I love that. It's a return to the old affliction where skill and timing of your rotations will get you that top DPS , while people who arent as hardcore can play decently with a much simpler rotation. When i first switched back to Affliction after being destro for several years, I started out with effigy, AC, sow the seeds...I literally only had to make a maco to target my effigy, cast CoA, then target last target, and I could at the start of a fight, drop my effigy, cast Corruption and CoA, target the boss, do CoA/Corruption and then go into a rotation of CoA, Macro CoA the effigy, UAx2 then two cycles of MF. my damage wasnt the best, but I got good enough to swap out Sow for SL, then occasionally move out of AC. I'm not a hardcore raider, but i was doing pretty good damage dispite my gear being probably on the low end of my raiding group (I have absolute shit luck with drops. Havent gotten a single shadow relic over 865...ever).
I have trouble believing that whatever replaces effigy is going to follow the same pattern we have seen all too often. on the PTR it will be OP. then a day after release on live it will be nerfed into stupidity.