200 miles towing is just about the point I would accept an EV.
There are some cars that can now approach 400 miles solo range, but they are more esoteric models, and rely on super low Coefficient of Drag (CD) figures to make them efficient. Hitching up a caravan will substantially damage that efficiency, but they might approach a 200 towing range.
I doubt we are going to see much further improvement in CD figures, or electric motors as they are pretty close to theoretical limits, so the last major factor in range is the battery capacity, size and weight.
Even since 2015 we have seen improvements in battery design, and now roughly 25 to 30% more charge capacity can be stored in the same physical size. and the power to weight ratio has also slightly improved, but there are several different new battery technologies in development which potentially could see twice or more the power density of present technology. which should produce similar improvements in vehicle range.
One of the other significant changes in the EV experience is how we are seeing much faster charging rates. There are now a number of 250kW and a few 350kW public chargers, and this now means you can get a useful amount of energy top up in 20 to 30 minutes rather than the "hours" many anti EV pundits will negatively headline.
Managing how you keep an EV with enough charge may require a change to the mindset of using single point refills like petrol and diesel. It also depends on your usage pattern. For any one who can home charge, it takes less than a minute to plug into a home charger with a tethered cable and similarly to unplug. I find it isn't an issue and an overnight (economy 7) ensures I always start from home with a full charge.