I sincerely hope that Tesla simply offers us a "Classic" or "New" option to switch between the different interfaces.
This is equivalent to the statement "I sincerely hope that Tesla doubles the workload of its software testers. Let's make sure that new releases come much more slowly and have more bugs. And while we're at it, let's make sure the developers have lots more work too, backporting new features to the old interface. That should slow things down even more."
Do you still think it's a good idea? I don't. I'm happiest when Tesla is moving full speed ahead with new and better stuff. If sometimes it isn't better, I have confidence they'll figure it out quickly and change direction.
Yet another thing that complainers here seem to be ignoring is that none of this is about you or people like you. This is all about getting to Model 3. You know, mass market. New Tesla drivers (who will at that point be the vast majority, render y'all about as important to the market as Roadster owners) won't care about EV nonsense, state of charge, instantaneous efficiency and such. They will be driving the best and safest vehicle on the road and care only about whether it has enough fuel to get to the desired destination, and if not then how far they can go and where they can refuel. If Tesla can get that right (and they've done a mediocre job on that so far) then the rest will make no difference. The fact that the car is an EV just won't be important.
It seems to me that the direction that Tesla is going is to provide to the driver, at a glance, a full awareness of what's going on all around the car. Perhaps soon this information will appear as part of a heads up display and thus not even require that the driver look away from the road. Needless to say this is mostly visual, but it also incorporates various auditory cues and the steering wheel shake. This is awesome stuff, and deriding it by calling it a "toy car" is just ignorance. Cars without sensors are already obsolete. Cars with today's sensor suite, incapable of fully autonomous driving, will be obsolete very soon. Tesla, like most high tech companies, will not put much effort into the software for obsolete hardware. If they put any effort at all into maintaining it, none of the best people will want to work on that team.
If you own an older vehicle and expect anything different, get used to disappointment. My P85 is less than a year old and it's already discontinued and missing the latest features. If I hadn't gotten lucky and got one of the first ones built with the autopilot hardware it would be even more obsolete. I'm neither surprised nor disappointed; I'm excited about how much better my next car is going to be!