I have long been of the belief that Twist's detailing of the exact means to get edge points was one of the worst blows to the system we could have done. Before that, you explored because you wanted to explore - or you thought that it was the most useful thing to do at a time and might get you rewards. You PK'd because it got you shinies, and you knew at some point, being involved in PKs gets you edges, etc. After the detailing, which as mentioned was requested (and I'm generally a fan of transparency), it became all about getting every last edge point possible from that list.

Secondly, the concept that players as a whole will ever be "satisfied", has long proven to be false. XP rates were increased, they're still slow. Bonuses, bah not enough. XP rates were increased even more. We're at a point now where people can and have power-levelled from creation to hero between my logins, and by and large I at least log in daily at least just to check in. No person in the game has ever said "Nah, I'm cool with just these two powers. Don't throw me that cool new toy, too". So at some point, you more or less need to decide what amount of toys you want to allow for customization, and have that as the standard. You lose all sense of customization if all paladins have all four dedications, or shamans every path, etc.

The two biggest issues with any sort of new edge system currently are:

1) Having someone actually rewriting the code to enact whatever ideas have been come up with.
2) Creating a system that encourages positive behavior from the playerbase, without creating something that can be exploited through means that negate the point of the system. So far, the only concrete way we've found in that sense has been putting more and more of the system back in the hands of Imms, which has its own issues of presence and perceived favoritism.