People will continue to buy brands they know and whose marketing aligns with how they see themselves. Not everyone will switch to BEVs for a variety of reasons - cost, lack of infrastructure, or hell, even contrarianism.

VW, Renault, Nissan, Stellantis, Toyota can change fast enough before BEVs are the only thing on the market. All of them already have models in various sizes (e.g. Renault make very good and adequate cheap EVs nobody else comes even close to in the big EU markets) and varying quality. It's easier for VW to improve their EVs than it is for Tesla to launder their image.