I don't think you're ever going to see Carplay or Android Auto (CP/AA) on the Tesla MCU because of Tesla's plans to eventually have a self-driving car.
It's not going to happen, and here's why.
1. Tesla is vertically integrated. They have worked hard to make sure you don't have to take anything out of your pocket to use your car, and you can control everything about the vehicle from the big touchscreen. It's a step backward to move the infotainment to your phone, away from the free Tesla LTE data connection, and make you get out your phone and plug it in every time you want to use the infotainment functions without killing your phone's battery. (Yes, some cars have wireless Carplay. It's a known battery hog.)
2. CP and AA could be a huge source of security problems. Security will be a huge concern in a Level 5 autonomous car. They won't really like you plugging internet-connected stuff into the car's bus and power supply. Also, if the car is operating in some kind of autonomous ride-share network, you might not want strangers plugging and unplugging stuff from your car.
3. People want CP and AA so they can use Waze and other nav apps, but to get to full autonomy, we can't be relying on a third-party app and hardware that can be unplugged or fail at any moment. Knowing this, the car is going to be using its own internal maps anyway for FSD, so why would Tesla invest resources to give human meat drivers the navigational options that you're actively trying to make obsolete?
4. Current AA/CP nav solutions don't deal with EV questions of charging, supercharger availability, range, etc. They also cannot monitor your car's efficiency and state of charge to know when to recommend charging. On a longer trip, where charging might enter the picture, you're right back to using the integrated nav system.
5. If you want AA/CP for the media apps, use bluetooth. The only thing AA/CP could give you is a wired connection (preferable, I agree) and the ability to search and pull up playlists/channels without referring to your phone. That's a small amount of functionality to be worth licensing AA/CP over it, and it is already possible to access voice command functions via bluetooth. Tesla is not doing that, but it could be in a future software update. We've already seen other bluetooth devices with "Hey Siri" and "OK Google" functionality, which would give you media search functions and voice-to-text. Audio can be sent wired or wireless and full voice assistant functions can be used without AA/CP.
6. If you're wanting AA/CP so you can get your phone's notifications on the car's main screen, that's possible without AA/CP. GM's been doing it for a few years now and Chrysler has, too. I don't know of a reason why Tesla couldn't do that via bluetooth and the existing hardware.
TL;DR - Android Auto and CarPlay work directly counter to what Tesla needs to accomplish to achieve a self-driving car. They need to build a secure, connected car that can do everything even when there's no one in the car or when there's a stranger in the car. Adding features that make it easier for humans to operate the vehicle is very low on the priority compared to making the vehicle operate itself. That's why AA/CP is never going to happen. Furthermore, almost everything you probably want AA/CP to do can and has been done via bluetooth for a long time and could be again, probably with a software update.