A'koss said:
It's not hard to see why they would introduce a half-fiend, half-celestial & half-dragon race to core D&D. Gnomes and Half-Orcs are the least popular races so they get cut in leiu of new kewl kids on the block. I'm just surprised they didn't include Drow in the mix...
I can see why, but I suspect that my answer -- "oh, cool, we have been free reign to change a bunch of stuff, and put our own artistic imprint on the game as uber designers" -- is not the same as yours.
I'm OK with moving Gnomes and Half-Orcs, along with Half-Fiend, Half-Celestial, and Half-Dragon (I know that Half-Fiend and Half-Celestial is not quite correct, but I don't have the proper description on hand) into a races expansion book. I'm OK with a reduction of core races to Human, Elf, Dwarf, and Halfling. (Which would you choose if you had to take a 90% cut of what races are played). I'm not OK with adding Half-Fiend, Half-Celestial, and Half-Dragon to core. To me, that is too constraining on the target world. For example, WarForged, Shifters, and Inspired are tied very much to Eberron. They deserve to stay there (and perhaps go in a races expansion book). I do not think that they deserve to be in the core rules. Human, Elf, Dwarf, and Halfling are standard fantasy races. They are not for all campaigns, but I'm thinking that most games use them. But Half-Fiend type race, and the others, that implies a number of strong features in the campaign world, and I'm not comfortable with accepting those features by default.
I suppose that one of my difficulties is that with the current rules you don't have to throw out too much to have a human-centric campaign, where the conflicts are between people, and anything non-human is by definition a monster, or not well integrated into society. The new rules make that hard.