I'm not really against the idea of a story coil, so +1 OP, but another thought I had is couldn't you guys wait a couple months until ilvl 150~ gear makes it even easier?
It gets easier with each update just because of the higher level of gear that's available (without even taking Echo buff into account), so I kinda get the feeling that in a few more months it will already FEEL like a story mode. It seems to me that by the time they would even get around to implementing a story coil (months obviously cause everything takes forever), you definitelyyyyy wouldn't need it.