Energy density will keep getting better as will tweaking the recipe. How fast this progresses, is still a somewhat open question. What can be accomplished in the lab may not pan out when trying to mass produce something, and then, you have to test them for reliability, and while you can simulate some of that, it takes some real-world testing. Last thing you'd probably want is a new battery that only lasted for a year or two. Not good for the consumer OR the manufacturer.
FWIW, at least in my case, living in a condominium, with the way things are wired, there's no way I could put in a larger EVSE. The average household may also have issues trying to install something that could recharge a huge capacity battery in anything like a timely fashion. Until something like Tesla's superchargers are on every street corner where you'd be assured of being able to find an open space and one working, bigger battery packs mean longer charge times for bigger batteries.
Just like in a home wiring situation, the bigger the draw, the bigger the gauge of wire you need. ANd, when it comes to the charging circuit...the guts must be heavier duty to handle the current. There are two ways to conventionally do that: put things in parallel and use the same things, but more of them, or beef up the one you have to handle it. And, more current means more heat since the conversion is never perfect, which means a bigger radiator for the cooling circuits and a bigger compressor, and bigger hoses, etc...which means a heavier car, which means your benefit for more stored power gets diminished because you're dragging around more weight. Look at a Tesla - their biggest battery pack - 85Kw, nearly 4x the i3's current pack. Barely 3x the range.