Toyota has made it known publicly that they aren't sure EVs are the answer and is why they are researching alternate technologies pretty hard.
Toyota knows what it does well and as a company they tend not to wade into new waters until they're fully prepared. They have deepest hybrid experience of any manufacturer by a huge margin, and that will continue to be a very strong segment of the market for probably at least a couple decades. Their plain-old ICE cars are also becoming quite efficient with no compromises. So it makes good business sense to play to their strength and let others work out what a successful business model looks like in the EV world. EV's are no doubt going to be a big part of the future of the automotive industry, but I'll agree with the others that have posted here that 100% adoption is just not realistic.