Two people said that'd like to see a new playable race and I was very surprised. Even spending a few minutes considering the idea you can come up with multiple barriers. Here's some straight off the top of my head:
- We have 4 more races than GW1 already
- The current Personal Story can't accommodate additional races
- Destiny's Edge represents each of the playable races
- So do the Biconics/DE2.0
- Every piece of armour in the game would need to be redesigned
Also, financially, redesign 50+ armour sets and sell a new race in an expansion for $50 or create 50 new skins to sell in the Gem Store for $12 a pop.
I just can't see it happening. Sorry.