Having done a long trip in an EV, in a very inhospitable location (the USA, without access to Tesla chargers), I'm not convinced there is an EV range/charge time problem. I think it's mostly in the minds of the public. Hence I'm skeptical that the changeable battery pack is a solution to any problem.
My experience was that you end up stopping to charge a bit more often than you'd stop to fill up gas, but factoring in stops for bathroom and food, it's really not a significant difference. There just needs to be more chargers (to avoid queuing for an open one), and chargers that are more closely spaced (every 50 miles like gas stations instead of every 100+ miles). Then today's EVs will be just fine for long trips. Not completely perfect, but perfectly adequate, to the point that it won't be worthwhile buying an ICE vehicle just to have it for long trips.
My experience was that you end up stopping to charge a bit more often than you'd stop to fill up gas, but factoring in stops for bathroom and food, it's really not a significant difference. There just needs to be more chargers (to avoid queuing for an open one), and chargers that are more closely spaced (every 50 miles like gas stations instead of every 100+ miles). Then today's EVs will be just fine for long trips. Not completely perfect, but perfectly adequate, to the point that it won't be worthwhile buying an ICE vehicle just to have it for long trips.