EVs are growing, and will continue to grow, for reasons unrelated to climate.
They are the superior product in nearly every way. Regenerative braking is a huge objective improvement. The acceleration and torque control is a huge improvement. The lack of maintenance is a huge improvement.
The only downside of EVs is range and charge time, and both of those are being actively improved.
Elon deserves some credit for joining on to Tesla in 2004, long before these benefits were clear, and for being at the first company to really demonstrate these benefits in reality with the Roadster in 2008. But I do not think the existence of Tesla accelerated the adoption of EVs by more than a couple years.
The Model S was released in 2012. The Nissan Leaf was released in 2010.