I believe every good investor would like to wait till Bitcoin Hits a $100k price and Buy any type of car they want which I would do as well because when it comes to Investment, I would rather wait to make the most out of my investment than to spend part on things like that however, Tesla is not going to be a popular car in my country as I believe they are mostly electric cars which their charge point is not readily available.
I don't know how many Tesla cars were sold as long as they adopted bitcoin as a means of payment. Tesla doesn't seem too problematic if not many bitcoin users want to buy their car because they already have a number of bitcoin that have been purchased a few month ago. If Tesla doesn't succeed in reaching its car sale target with bitcoin, then they will profit from the increase in the price of bitcoin. Remember, they bought $1.5 million bitcoin a while back.