I can certainly see the argument for avoiding rules for small characters in a basic set, because it's one less thing to memorize. However, if you're going that route, then it would be best to eliminate races that don't have a base movement rate of 6 squares. That takes both dwarves and elves out of the picture. Races with an alternative form of movement should also be excluded, so that takes eladrin off the list. (Hey, if they can't start with a fly, climb, or swim speed, teleportation should also be off the table.)
That leaves us quite a few choices... but then there's the problem with unequal senses too. No, not the skill bonuses, which are fair enough. I'm talking about the different levels of vision. Well, if we're going to keep that level, we just have to get rid of drow (darkvision) and either everything with normal vision or everything with low-light vision. Since we've already taken halflings out of the game, we're left with either dragonborn and humans on one side, or half-elves, half-orcs, and tielflings on the other. Since the latter three races are all of human descent, it would seem rather absurd to allow them but not humans as player options, so human and dragonborn look like they should be the default.
And really, maybe it would be best to leave the dragonborn out too. Why confuse new players with racial options when they've still got to sort through the classes as it is?
This is the problem with designing a basic set: you know that there are different options that will lure in new players. Some will go for the option they see as the most alien, or the prettiest, or reflective of the underdog. We don't all have the same fantasies. Maybe the basic set should stick to humans after all, giving new players a chance to experience what the wider rule sets offer to them without overwhelming them out of the gate.