Multiple forms of ID work better
It is better to require multiple forms of ID. If you have one form of ID then the criminals can focus on these.
It is rubbish that the cards will not be forged due to "biometrics" as one MP put it. All biometrics will prove is that the card contains your retina scan, DNA or other attributes. It does not prove the information on the ID card is valid.
When applying for an ID card you will still have the process where someone will have to vouch for you. Sure, they will toughen this up, but once someone has stolen your identity and registered an ID card with it then you're screwed.
It's a similar argument to the banks saying chip and pin is secure and don't believe ATM fraud is possible. They believe so much in the technology being secure that they won't listen to anyone who says otherwise.
Having multiple forms of ID means you're not putting all your eggs in one basket.