I can see that. A good reason not to buy one today. Maybe by 2030 they will be roughly the same price.
So, would I buy one then? Probably not. Let's say I want a vehicle like a Honda CRV, or our Hyundai Tucson (which stickered over $40 K, it's loaded). If an EV version equivalent to a CRV cost say $30 K and the same as a similarly equipped gas CRV, would I buy one? I'd have to do the math on that, and of course assess how infrastructure chances and see if that $7500 is still around.
Let's say the EV uses 28 kWhr per hundred miles (that's being generous for a not very aerodynamic boxy vehicle). Maybe charging away from home costs are lower, say 30 cents per kWhr. I'm at $8.40 per hundred miles. A CRV like PHEV wouuld probably cost more per hundred miles because the gas engine would kick in, but then gas prices are a factor. Our hybrid would need about 3 gallons per hundred miles, around here at $3 per, that's $9.00.
Then I'd think about insurance costs, repair costs, depreciation, etc. It's not a slam dunk for me.