Ed Sun, managing director and portfolio manager at investor Engine No. 1 in San Francisco, said startups may lack size, but can survive because they often have better software, range, vehicle technology, or a niche.
"The new players are clearly going to take share," said Sun, whose firm owns GM and Ford shares.
For British electric van startup Arrival, low-cost innovation is the way forward.
It plans to develop "microfactories" and use a low-cost, lightweight plastic composite for van bodies. Backed by its own fleet management software, its executives say it's a better van than a diesel equivalent for the same price.