The biggest issue I've seen is the jump from getting level 50 to running hard modes.
Players are forced into PvP, which will ultimately hurt their experience if they HAVE to PvP or get ridiculed by their teammates in FE or BoI.
If any of these happened, you'd see the game fail just as MXO did. (Not a similarity example)
And OP, don't ridicule your thread posters. You look as stupid as they do.
Don't play Favorite Youngest Child. The eldest will only attack harder.
You will see opposition, your quest hubs being attacked on leveling planets and Ilum worse than ever. (We are the Bad Guys, Group together like we do and FIGHT)