I don't think the Sorcerer has changed as much as some people think. The new wording for Elemental Affinity is the same as Empowered Evocation, but Crawford has been explicit in the past that each Magic Missile is intended to benefit from Empowered Evocation.
New wording: "Empowered Evocation (p. 117). The damage bonus applies to one damage roll of a spell, not multiple rolls". I don't know what that's supposed to mean, but check this out:
https://twitter.com/jeremyecrawford/status/557820938402947072
If we use Jeremy's twitter response as a guide to interpreting the errata (sigh), then Magic Missile and Scorching Ray only roll 2d6 once (+CHA/INT), and then you apply that to the target X number of times. It benefits "only one damage roll" so it's not (1d6+CHA)+(1d6+CHA), it's just 2d6+CHA times 3/5/7/whatever. So Magic Missile/Scorching Ray will have a very high variance.
Anyway, the only Sorcerer "nerf" I see in this errata is therefore the Twinning thing, which was controversial anyway. Evokers are actually hurt much more because Overchannel has been clarified to not work at all on cantrips.