The biggest problem with Content Finders in any games that have implemented them is that they render the entire world obsolete.

If SE wants to implement this feature, they need only make one alteration to the standard format of the Content Finder. Do not let the player who are auto-grouped be teleported right into the instance. This one simple change will undo all of the damage Content Finders have done to ever other game they have ever been implemented in.

When you allow players to be ported directly from any place in the world into an Instance with a random group of player, they never have to leave town again. This is undeniably a negative impact on the game. The worst part about it is, Every single game that has implemented a Content Finder has cause this exact issue. See WoW/LOTRO