Original thread can be found here:
http://www.gamesas.com/topic/1433068-please-please-do-not-faction-lock-races/
5) It makes no sense even when considering the established lore for the game, as none of the factions are purely race-based. If they were, there would be 9 separate factions.
Imagine how god awfully hard, how long it would take and how much work it would take to design 9 entirely seperate and different leveling sections of leveling content and even more to try and add addtional content to those 9 provinces a regular amount without a good 6 or 7 provinces playerbases going up in arms at the slow speed of content or general lack of it. Not to mention just try to imagine how stupid it would be to see a 9 sided war going on.
Imagine how god awfully hard, how long it would take and how much work it would take to design 9 entirely seperate and different leveling sections of leveling content and even more to try and add addtional content to those 9 provinces a regular amount without a good 6 or 7 provinces playerbases going up in arms at the slow speed of content or general lack of it. Not to mention just try to imagine how stupid it would be to see a 9 sided war going on.
...what makes you think having 9 entirely separate leveling sections is even necessary or would be the only option?
How about we have the player level via exploration and choosing what content they dabble in instead of having dedicated "leveling zones"? Why can't they just have content for EVERY level in the zones, and leave it to the player to explore-choose what he/she does and how he/she levels? This should be Elder Scrolls, not Warcraft.

