Well Toyota reckon they are close to a battery with a range of 750k and a 10 minute charge.
There is no way I would be hurrying to get an EV at the present time. Technology is moving far too fast.
Actually I'm not sure I would say that. We've got to the stage where we have the basics in place, where ranges are now at the bottom end of ICE cars (I've had an ICE car that could barely scrape 270 miles from a tank) - and more importantly the ranges are more than >90% of people do in a day in the UK or US. And prices are coming down, such that in some cases (like the Frontera) they're the same for ICE or electric, and in most cases the total cost including fueling at home is the same or less for electric.
It's not perfect, but we're at the stage where the technology of new EVs is good enough for most people, as evidenced by 90% of new cars in Norway being electric. It's not all sunshine, but the cars are good enough for most people and that "good enough" technology is going to grind down in price relative to ICE.
Yes there's solid state batteries and others on the horizon, but I'd think of them as supercharged V8s - it's great that they exist and allow cars to do 0-60 in 4 seconds, but we don't put V8s in every car because they are more expensive and most people don't need 0-60 in 4 seconds, they'd rather have a good enough car that was cheaper. Solid state batteries will have their place in premium cars and will eventually trickle down to runabouts, but it will be more like the spread of fuel injection or ABS rather than a sudden rush within 2-3 years.
The big unknown is how expensive they will be, all we know is that to start with they will cost quite a lot more than current batteries.
It is still going to be a big pull on the grid all electric vehicles.
It's not a negligible problem, particularly for "en route" charging, but longer ranges will reduce the need for quick charging en route, over 85% of charging currently happens at night though, and vehicle-to-grid allows EVs to help out the grid at peak times.
Elsewhere I calculated that electrifying all UK road transport would need the equivalent of 18GW continuous, or 54GW for 8 hours a day, which is doable- but that was based on an average efficiency of 3 miles/kWh, we're now starting to see cars claiming 5 miles/kWh. Grid will come under local strain, but again it's not rocket science to fix, again you can look at Norway for how they've rolled out chargers.