I already did! (2017 Model S with Full Self Driving option) Of course, it needs some software updates for "full" self driving, but the system as is is pretty amazing. It is incredible to watch it drive down the 5 freeway at 80mph in moderate traffic and even change lanes on its own while maintaining spacing with other traffic.
One thing I've learned from owing the Tesla is that much of the performance driving I do (max acceleration, quick lane changes, heavy braking), while fun, is often motivated by the need to avoid the inattentive, inefficient, and otherwise deficient drivers that fill up space on the roads. While I love driving (I kept my 2-seat sports car in addition to the Tesla), I actually might trade some of the fun of driving for the efficiency of full autonomy that can ensure the most efficient use of the roads for ALL traffic. No more honking at the driver who is sitting still at a green light while texting, no more sudden evasive maneuvers when someone changes lanes without looking, no more missing traffic signals because the person in front of me lagged until the light turned yellow, etc. I agree that i kind of lament the loss of the fun associated with spirited driving, but when I think of how autonomy can fix the problems with all the OTHER drivers on the road, I might be more willing to give up the fun part.
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AI coupled with synthetic vision is really the solution. The technology is certainly capable of detecting and responding to a deer darting out in front of the car much more quickly than a human driver. I'd trust the computer with that any day. The state of the art in synthetic vision is very mature. The AI definitely needs a few hundred million more miles of data to assess before the systems start getting to a level of reliability that we need, but we are close.
It's really a relatively straightforward engineering and computing problem that is rapidly being solved. I agree we're not there yet, but it's not far off.