I tried to use the 2017 MacBook's camera for FaceTime yesterday. Man, it sure is crappy. The 480p isn't great, but what's worse is the low light quality. It's horrible. So I just used my iPhone instead. Way, way better.
The reason I tried using the MacBook is because I had a wired Ethernet connection for it. Nice stable connection. But it turns out the WiFi in this hotel is pretty good, and I'm not stuck at the desk on WiFi, so I'd prefer to use WiFi anyway. So, in 98% of cases, the FaceTime camera of the MacBook is superfluous to me as I would just use my iPhone 7 Plus for FaceTime.
Perhaps that's why Apple isn't in a hurry to up-spec the camera in these. I realize the technology may not be as mature in terms of sizing, but if they can put a high quality front camera in the iPhone, then they should at least be able to put something nicer in the MacBook too. Maybe not quite as good due to the thinness of the MacBook screen portion, but better than what they have now. However, since so many MacBook owners would have iPhones or at least decent Android phones anyway, this MacBook camera is of secondary importance.
Maybe I'm extrapolating too much, but that's certainly case for me. If I had to choose, I'd pick an improved trackpad over an improved FaceTime camera. The trackpad in the MacBook is a bit weak in its haptic feedback. It's certainly a step down in feel compared to my now ancient 2009 MacBook Pro, or my even older 2008 aluminum MacBook.
However, the feature I want the most is a 2nd USB-C port. And then after that, Thunderbolt 3. So here is what I'd look for in a future hypothetical MacBook:
1) 2 x USB-C
2) Thunderbolt 3 support, along with 10 Gbps USB-C
3) Improved trackpad
4) Wide colour gamut screen
5) 1080p front FaceTime camera, plus or minus FaceID