This is what they call an 'inflection point'. The traditional car makers are trying to adapt, but they have so much union baggage in terms of work practices, wages and pensions given too early and in excess that are underwater in terms of their supportability in terms of the interest yield of the underlying monies, which may well force them into bankruptcy. As they start gas car sales aill fall off a cliff as people choose to wait for an electric car instead of buying their next gas based car.
Will they try to take over Tesla? I think this recent Solar City takeover is part of a plan to interdict any potential takeover, and all Musk has to do is ask his car owners to buy 100 shares or more and bid up the prices and deny those votes to block it.
To the extent that "workers' rights" as expressed in union contracts make legacy car companies unable to compete, then yes, we might have to allow non-competitive companies to be crushed by competitive companies.