Core Races
Like has been said before, you certainly don't need half-anythings, but if you were to get rid of the half-templates, that shouldn't necessarily mean you get rid of the core half-elves and half-orcs. While I don't really see myself doing this, especially since I'm pretty much dedicated to Eberron, I could see making a race list that was human, dwarf, elf and gnome, with the addition of modified LA +0 aasimar and tiefling. Aasimar and tieflings might not be descended directly from celestials and tieflings, but certainly something in their backgrounds would suggest a connection. That would get rid of the half-elves, the half-orcs, the half-lings and the half-templates, while giving the small schtick entirely to gnomes, and having a core race that made good clerics. Tieflings and elves overlap a bit, but I think their fluff is unique enough, and perhaps you might drop the dex bonus from tieflings and give them a bonus to strength, or alternatively, rebalance all of the core races to be equal to a +2 str, -2 dex, +2 con dwarf, -2 cha dwarf.