They've successfully kicked the transition down the road for 20 years. Why would they think that some Silicon Valley Startup is a reason to maybe stop kicking and try?
Sure, they had reason to look at the EV1 20 years ago and say, there was a market for that caliber of EV. Looking at the Model S in 2012/13, they had reason to realize, that the market will be a Tesla caliber EV (by this I mean basic performance and range, not Model S size or luxury). I think the vast majority of automakers have realized this by at least 2014. They've simply also realized that pushing off as far as possible the implosion of their ICE business is more appealing to them than transitioning to EVs, Tesla taking 5% market share in several years of an auto market expanding by 10+% notwithstanding.