"Mix" would be fine if the station had been a "Mix" all along, but it is certainly too dated to use as a new brand in 2016. We've had our Mix 102 in the 90s, then the (mostly forgettable) Mix 103.9, but in 2016, it just seems like something old.
Personally I never saw a huge problem with the "Lite" name on 106.9. It didn't fit what the format had become, but it was part of their identity. Sort of like how 93.1 isn't an actual format about foxes, but is "The Fox" and it is a name that fits (maybe that is an extreme example). There are a lot of "Kiss FMs" out there, it sounds like it should be some sort of romantic format, but it isn't... and it fits. There is a certain religious based format out there with the name "Love" in it (I won't say it out loud because any time I do, it summons somebody in here who searches for every mention of the name of it to start a religious rant on me) that isn't actually about romance despite the name, but it fits too.
The bigger question though is whether Mix would even fit in at 106.9 if it wasn't dated. Mix still sounds more AC than Hot AC, while this Play (to me, at least) sounds more Hot AC or even close to CHR. I'm just wondering if this change means that they will more or less eliminate all of the 80s and most of the 90s stuff, in which case it would be more than just a name change, but also a format change.