Hi, my take is SS Batteries are still some time away, at least from mass production. My goal is to get people into a vehicle with a plug (preferably an all-Electric vehicle) but I understand BEV may not work for many where a PHEV can. Sooner we can get into a Plug, the sooner we can impact CC.
Now saying that, you can't be like waiting for the next computer to come out as we did in the past, or the next TV, etc. This EV market will change at a good pace, however IMO pack sized will stabilize and it will be more about size of the vehicles themselves that matter (compact vs. full size, etc.).
If you are in a position to do something now, I would certainly recommend you not wait. All cars depreciate, most 30% as soon as you leave the lot. They are never a good investment for making money, unless it's a classic car, hot rod or super luxury car.
Even a Tesla will depreciate and it will be hard to make money on selling a used Tesla, considering what you paid, cost to operate (being low anyway), maintenance (mostly lower) - all these factor in. So IMO don't even consider depreciation and resell values UNLESS that is all you want to do - than LEASE. If you never want to own a car and just make payments continuously (maybe for tax reasons/business, always want a newer vehicle in warranty, etc.) then that is your option to do.
I for one never want to do that and purchase all of my vehicles either up front or financed, but pay them off quickly to avoid more interest charges.
Now for your questions, 1 and 3 seem to be the same so I would say no to waiting.
Number 2 is up to you if you understand Leasing and are ok with it. Remember, if you lease then purchase, you'll be paying for something you don't own or really have any equity in until you either buy it out or then purchase another "new one".
Hope this helps and if you have more questions, you can email me a
[email protected].