Perhaps charging station tech advances the quickest. A business produces commercial chargers and markets them to trendy coffee shops with strip mall parking (that are likely to have "green" customers) or perhaps to non-munincipally owned parking garages in urban areas. And another startup develops and markets commercial chargers for households with garages.
Capitalizing on a decentralization trend (computers in every home) has great business potential. But the venture risk might be too high due and corresponding probability of success too low for this particular paradigm to take hold.
Battery swapping for trucking has the advantage of being a smaller, easier to target market. But the disadvantage of less electric vehicle tech.