Eberron's new Changeling is the first class that can start with an 18 ability score at level 1. Although this "power creep" doesn't mean the class is unbalanced, the answer to rebalancing the race within the existing design paradigm may lay within cut content.
I recently ran a poll asking players what races they thought should have Darkvision. With over 2500 responses in the first 24 hours, players expressed strong sentiment that many of the races should have their Darkvision removed or modified from the rules as written ("RAW"). Here are my observations, as well as a chart identifying what races have Darkvision by popular demand.