What happens if someone fakes a signature to their consent, unless another new way of doing consenting comes about as proof.
It will 100% be abused.
That's not how it would work It would be fairly easy to have a non-abusable system. Have the hospital doctor / GP agree it as an option then have an independent doctor (or even two) from another hospital or even an independent body for this purpose sign it off. It's not as hard as the naysayers say.
Sorry to hear about your Mum OP. MPs have been debating it again recently (https://committees.parliament.uk/co... the,be learnt from international experiences.) but every time it's been voted on in Parliament it gets denied.
My own view is that it should definitely be available, I wouldn't want to have something that leads to me being unable to care for myself like dementia.