I loved Level Sync in FFXI - it really helped reduce the time it took to form a functioning XP party. And yeah, Yoshi and the devs have confirmed its coming (in some shape or form).

I don't really understand some players' arguments against it; my guess is maybe they had a few bad experiences with it or have heard some unconfirmed rumors about it or something. Not saying it'll be the "miracle patch" by any means, but its the only way to get 6 - 8 players who are LFG and gave a 20+ level gap to be able to party with each other to gain optimal xp.