Unfortunately customer demand isn't that dedicated nor coercive. Customer's will complain for all of a second (or not at all) and then buy the car anyway and they clearly know this. I think it is safe to assume Toyota isn't supporting this because no other car companies are either. It is clear they have had their back room meeting on this.
What car company is releasing a car with Car Play in it this year? How many of their cars will have it as an option?
That's what I think. If Honda/Acura, Nissan/Infiniti, Hyundai and the others were introducing vehicles this year that supported CarPlay and Android Auto, you can be sure Toyota/Lexus would do the same. In other words, if you really want CarPlay or Android Auto in your next vehicle, you probably should avoid most 2015 models and maybe even some 2016 models, depending on long auto companies drag their feet on this. Either wait or go aftermarket with Alpine, Pioneer, etc.