I think it would make sense in areas with full fibre coverage PROVIDED they offer a comparable service. That is they install an ATA with battery backup that presents a standard analogue phone port for the same price. That way they can start removing copper to make way for more fibre.
In areas not covered by full fibre this seems very short-sighted. BTs companies benefit greatly from the legacy infrastructure, in my opinion that comes with an obligation to ensure basic services are provided at reasonable pricing.