Let's be realistic here.... A new player picking up the game on the expansion isn't going to drop the game because the job they wanted to play is gated behind the main story line. They'll drop it most likely when they will realize that already 2/3rds of the current available content is pointless and obsolete. The main story line can be completed in what... a weeks worth of game play. Then they'll jump on the new jobs and play the new expansion stuff instead of wasting time on old 2.0. The rest of the 2.0 stuff can be skipped, heck even the the none story dungeon can be skipped. You can thank the lazy vertical progression design that SE decided to use.
