Personally, I would not mind the idea of identity cards, especially since so many of us already hold them (with driver's licenses or state IDs). But if the stakes were high on identity cards, and it's likely they would be--if used to find illegal immigrants and deport them, for example--then it stands to reason that there would be a market for counterfeit identity cards.
No current identity cards available would not be harder to fake and more secure, because technologies that are currently used already employ many security features. As long as there is profit to be made, there will always be attempts to fake identification cards. What cards exist today on a state and local level already have security features in place.