Well, with regards to teaching parents to become better parents - do you really think that that's really going to be cost effective very quickly?
Also, how do you propose doing it? Forcing every parent to attend - that's going to cause a lot of people (and probably the same ones who don't like nursery for 2 year olds) to get upset at being patronised.
How do you ensure that whatever has been taught will then really be done? It's not so much about knowledge I guess - most people will be aware that ignoring their child all day is not a good idea - it's more about giving them support to break through behaviour in which they end up ignoring their children. And that's not cheap, easily implemented (again, how do you identify those at need? Blanket solutions will a) be costly and b) again annoy those who don't need this support). I don't think that surestart alone was or would be enough to tackle this, as it only reached people who actually actively chose to go there.
A good nursery environment, in my eyes, is probably the most easily implementable blanket solution, with immediate effects, as it doesn't hinge on parents altering their own behaviour.