What is the current potential of advancement of Electric Vehicle technology?

homegardener
What is the viability of EV tech actually being advanced enough anytime soon to be:
a. Economical
b. Heavy duty
c. Developed supporting infrastructure
d. Efficient

Of course, even Tesla has been the pioneer in this regard but its still a long way from being mainstream and replacing the internal combustion engine. In India too, recently, Revolt (an AI driven electric bike) was introduced by Micromax cofounder.

Also would political-corporate lobbying allow it either since it would be a huge blow to the OPEC (and hence the petrodollar)

For Indians, I ask this in the wake of the Union Budget-2019 presented here which proclaims a fillip to the EV tech industry (of course, it is a blatant gimmick to justify the cesses on fuel but it MIGHT just build some demand).
What is the current potential of advancement of Electric Vehicle technology?
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