I can't see Tesla BTC as anything more than a marketing gimmick for their computer geek clientele and fan base. Even if it's a logistical disaster, they probably make it back in stock purchases from true believers.
Tesla tested the waters with Elon's tweets and it shook the Bitcoin and sent it to all time highs, then Tesla bought large amount of Bitcoin and now the market exploded even further. It is a marketing gimmick, true, but it is making Bitcoin more volatile and unstable, while Tesla hoards more money from Bitcoin!