Interesting, we have not seen this condition. I'd like to get more details and document it. Generally the car can take a few minutes and start up, never had anyone that needed to reboot. Also if you can reboot, the mcu is not totally dead yet. as a dead one wont reboot.
OK, so this is the experience I was having. Note that it's told from my personal observations, so any conclusions I'm drawing are limited to that. When the MCU went out, the car would be very slow to power up the next day. It would almost always show the slide up notification on the IC that says, "Please wait as systems power up" or equivalent. That would stay up until I depressed the brake again after a reasonable period of time, at which point it would slide back down and the car would be on. If I depressed the brake earlier than that, it would stay up.
After a week or so, what I would see after a longer sleep period would be that the car wouldn't start up at all. I wouldn't get that notification when I pressed the brake. The brake would depress deeply, as if power brake was working, but nothing would happen. I tried everything during this time with no success, until I finally tried holding the scroll wheels and "resetting" the dead MCU. The MCU stayed black. Nothing seemed to change, except that when I depressed the brake after a period of time, I'd get the slide up notification and it would act as in the paragraph above. That was a repeatable process, and when we went on a camping trip, I was able to do it each morning to get the car to "wake."
This morning, after the car had been sitting undriven for weeks, depressing the brake would give me a deep depress, but after some time it would push back up, as if power braking (or whatever allows the brake pedal to easily depress) turned back off. I never got a splash screen, my scroll wheel reset didn't work, scroll wheels with brake didn't work, top button IC reset didn't work, etc. I tried everything for an hour, including holding the brake for a full 10 minutes even after it pushed my foot back up (Tesla's suggestion). Eventually I disconnected the 12V battery terminal for 5 minutes, reconnected it, and the car powered up as in my first paragraph above.
Wait, what? How far is the SC? Are you out of warranty? I need to get my car towed to the SC here which is 45 minutes away to get the MCU repaired and some other things, so should I expect a tow bill? Otherwise, I'll just call AAA instead.
My car failed 3 months out of warranty. So yes, I'm out of warranty now. The $340 was Tesla's quote to me to tow my X 35 minutes to my SC. They said it wouldn't be covered for repair reasons, and that's what instigated me to remove the frunk bucket and disconnect the 12V. My tow quote might have been higher because I was nosed into my garage and the car was unable to be moved, due to having no ability to put it in neutral. They would have had to use dollies.
Either way, the way it worked was that they provided me a quote and asked for me to approve prior to sending anyone out. You can give that a shot, or as you mention, use AAA. Unless you're under warranty, in which case you're all set by letting them foot the bill.