Why? It should be up to the consumer at the end of the day. Sure if everyone in a city is on fibre and there are only a few left on FTTC then maybe I agree with you, but until that happens, people should have the choice and not be forced to move by increasing prices for FTTC or making out that there is fault that can't be fixed.
Because it costs more to maintain a copper service and consumers are putting up with an inferior service without even realising it. Plus there
are faults that can't be fixed.
At the very least, customers should be warned if they are experiencing a slower FTTC service when FTTP is available to them for the same price.
By not pushing people to FTTP, especially people still using the phone line for calls, its just going to result in a really bad situation later when POTS is retired and they're trying to migrate people over to VoIP, some on FTTC connections that are saturated so will perform poorly on VoIP.