Level sync in FFXIV as it stands would not be such a bad idea and I can understand why they implemented it in FFXI.
But, if they get rid of the physical level and change skill point allocation to a system similar to FFXI- i.e. having to actually skill up magic/attack attributes (e.g. sword skill or enfeebling magic)- then in my opinion I hope they don't put level sync in. Playing with people that did nothing but burn through levels synced to somewhere like the dunes, and then trying to hit stuff at a higher level without capping their appropriate skills was just awful.
Warrior - *whiff* *whiff* *whiff* *whiff* *Hits for 1 point of damage* *whiff* *whiff* *whiff*..... you get the idea.