Interesting theories -
Interesting theories - however I doubt that they're correct.
Upping the current requires more than just a small battery change - it'll require rewiring and better cooling.
I suspect that the 150A limit is fixed, we might be able to stay at 150A for longer, and the step-downs may be higher, but I doubt it will exceed 150A.
The battery would need better cooling - they could accomplish this by adding a second cooling plate to the top of the modules, and put aluminum fins between each cell (instead of every other cell), and increase the cooling capacity by probably 3-4x, enabling faster charging, but that's a pretty decent modification to a battery design that they're only planning on keeping around for another few years at best.
Also, current charging limits are 150,100,60,40,25A - at least from all the data that I have collected.
I'd also love to see a better battery heater, but I suspect that the cooling setup is probably the limit - even if they put a bigger heater, it wouldn't be able to transfer the heat to the battery much quicker than it does now.
Having battery charging pre-conditioning would be amazing and trivially simple to implement.