It doesn't really matter, for what it's worth I don't agree with a nerf this early but I don't really care either way. They have made it clear very early that is the design philosophy of this game, that old content will be nerfed as soon as new content comes out for the hardcore progression players with the idea that is satisfies both casual players and the progression crowd. I think this leaves a void in the middle though, and if I was game director nerfs will be way down the track. The difficulty ceiling should be high and not just a single piece of brand new content with everything else zeroed out, giving a vast spectrum of difficulty with all sorts of players at different stages.
To be honest though Twintania as it stands is something you need to grind out in a group, with no quitters or impatient people. I believe way more people could do it as it stands if they stop regarding coil as a 1-4 job, get everyone together for a straight weekend and play all day non-stop. I say this as someone who cleared it well after BG and certainly didn't down it fast, but it's content at a level where if you have a slow pace and never have long sessions it might be out of reach, and you get stuck in a rut. You have the opportunity to do it right now, but you have to put in a fair amount of work that I won't call casual play to down it, and if you can't then the nerf is probably what it will come to.
It is entirely possible to create content where a certain amount of casualness just doesn't meet the bar, and it's reasonable to expect it in content that the developers specifically branded as "hardcore content". When game developers dictate design decisions they are in fact, deciding many things for you including the timeframe. That is their right as a designer.
As I said though I don't agree with removing it altogether, game experiences should never be completely removed from the possibility to play it but in MMOs it's a matter of when not if.