I think the current policy wonks holding the reins are in a "more flies with honey" state of mind when it comes to foreign policy. I mean, Cuba and Iran. The other thing is that Europe has reason to need to deal with Turkey - Syrian refugees aren't coming to the US unless they're either damn lucky or damn cosmopolitan. AND they're shooting down the Russians.
I'm not as up on Turkey as I should be but I think pressuring Erdogan has Turkey ending up with somebody worse. It's like, Khatami wasn't great but boy howdy did you want him back once you were dealing with Ahmadinejad. Considering how badly Turkey wants into the EU, this might actually be a spectacle that the United States can watch and tweak from the sidelines.