I think the really big shake up has to be when Toyota, the world's largest (if not the most valuable) car maker starts to get serious about electric cars. Toyota's position is really odd, given the way they tackled their "Millenium Car", which became the Prius, with the goal of producing zero emission cars in the early part of the 21st century. It's almost as if, having poured all that innovation into the Prius, Toyota have lost interest. The Mirai fuel cell car seems like the Betamax of EVs now.
Toyota seem to have finally woken up, with their battery EV vehicle launches scheduled for next year, but I have a feeling that it's too little, too late, and that Toyota seriously missed out by not capitalising on the technological lead they developed in the 1990s, with what became the Prius. Volkswagen seem likely to win a significant part of the big market for C segment cars, simply because they don't really have much competition. Tesla don't seem to be interested in smaller cars, others, like Honda and Fiat, seem to be focussing on electric city cars, and probably VWs biggest rival in the C segment category, Toyota, seems to have taken its eye off the ball. All VW need to do to succeed is sort out the bugs in the ID.3 and the chances are they will have another Golf in terms of sales success.