As the parent of a mixed ethnicity child, my wife and myself being different basic ethnicities, I can totally say it is not racist at all to use the term half, in fact that is how we all describe our son, him included. He is proudly half one thing and half another thing, total reality. Heck I'm mixed ethnicity just not as obvious as our son. I'm split into 1/4s, and yes I say my ethnic background is 1/4 this, 1/4 that etc...
And they killed all the cool stuff that made half unique, now it's just one thing mechanically with another made up description. So yeah they killed the fun and cool part. You should be able to pull from both races and mix them together, it starts getting racist to me when we say one is the dominant race over the other like they are proposing now, that sucks like wotc does in general these days.
See, look how that went...