Battery technology is improving quickly so I would expect they'll get better for a given price.
I would suggest the pace of battery development has slowed considerabky in the last few years. LiOn has one almost as far as it can go developmentally and we really need a breakthrough or a new technology. In terms of energy density little has changed in 2 decades.
Furthermore, there is a massive ramp up in demand for the raw materials due to the rise of the battery car.
And then there is the rise in demand, and consequently price, of the bicycle itself.
As things stand today, I reckon the foreseeable is not going to bring any appreciable reduction in ebike prices, and on the balance of probabilities a continuous, inexorable rise in price seems most likely, and will continue until otherm currently unforeseen market forces intervene.
I don't have an ebike but I have a good friend who uses one to commute five miles to work in London. He's been doing so for a few years. I was amazed at how heavy it is compared to mine.
Indeedy. Mine is at the lighter end of the scale for a full size, XL, diamond framed ebike at a mere 18kg, which still dwarfs the lardiest of my full squidge MTBs.