Some of them will have, but not all. Shorting a stock gets expensive. Anyone making a bet that Tesla will run out of cash and wipe out its equity are probably still loosing.

"Short sellers who believe shares of are due for an imminent decline are paying a hefty price to place their bets, with some shelling out what amounts to an annualized cost of between 90% and 120%" http://blogs.wsj.com/moneybeat/2016/09/22/teslas-short-selle...