Would you buy Tesla using your Bitcoin or you will wait to $100K?

Both

, i'll wait untill it reaches 100k, then buy a new car

That being said, i'm a fan of Toyota, so i might have to wait untill they accept BTC payments...
That will also happen very soon, Toyota as a company will want to advance their payment system and at that they will definitely accept bitcoin in the future, as the adoption of crypto payment get bigger more and more companies will buy into the idea of using a digital currency for purchase of they cars and other goods.