Electric cars get about 3-4 miles per kWh and efficiency is only going to get better, not worse. People aren't expected to drive substantially more in distance than they already do. So the overall energy needs of electric cars aren't really expected to go up. There's immense demand for improvements in range, but that's just a buffer; overall mileage (and therefore energy consumption) isn't expected to change.
Cars also spend most of their time parked, and this isn't expected to change either. So ordinary 7kW AC chargers are adequate, and expected to remain adequate, at places where cars spend most of their time parked such as at homes and car parks.
Therefore, there's basically no reason to expect a regular 7kW AC Type 2 electric charger to be obsoleted in the future. Just as a typical home in the UK hasn't needed its 100A incoming supply upgraded in a long time either.
Rapid charging demand is very different. This is relevant for places like motorway service stations, and where electric car owners don't have a charger at home and have to charge en-route. But if anything the demand for rapid charging will go down in urban areas as "slower" chargers increase in density in places where cars are typically parked. That leaves places like service stations. These will probably need to be upgraded regularly as you suggest, but that's a very different proposition to having to repeatedly upgrade every lamp post.