Add that to the increased cost in electricity as the capacity falls. Plus the decreased distance you can drive per charge.
Cost should not be a long-term consideration for anyone purchasing an EV vehicle. Government's natural tendency is to spend. When you reduce purchasing fuel, or stop out-right, you reduce the amount of taxes collected for "roads." (Quotes because the money is hardly ever used strictly for roads, just like your social security tax is not actually kept in a trust account with your name on it.) When that happens, electric rates will have to increase or, as in some states, EV drivers will pay an additional tax to register their vehicles or we'll all be imposed a mileage tax.
As another example, municipally-owned utilities which encourage extreme conservation* more often than not increase rates because the governing authority becomes starved of revenue.
* Conservation means to not waste, it does not mean to go without. (Paraphrasing a quote I saw a while back.)
