YANBU
Although how do you know that it is the middle class that are attending these centres? I've started to go to my local one (which does not have baby massage/classes or anything like that) and I have no idea of the background of the other mums. Even when I talk to them, we talk about the babies, not whether or not we drive a 4x4, have a giant mortgage and live in a detached house (I only tick one out of three of those boxes).
I think it was MillyR who said make the centres available for wider services. I agree. What's the point of letting these buildings and facilities go to waste? Perhaps it should be a case of local providers should be used for things like baby massage/sing and sign classes. Have regular drop in sessions for health visitors/midwives/GPs.
Someone said that local mother and baby groups were shutting down because of the CC. Er, not where I live. I can't move for M&B groups - although they all close for the summer holidays, hence me going to the CC instead.
Also all this talk of CC nurseries - I didn't even know they existed! It's all private nurseries around here - and it's bloody difficult to get a place and the nurseries know it. One nursery manager was very rude to me on the phone when I enquired, saying I better sort out my work arrangements - and the nursery wasn't even that good 
I do think the centres could do a better job of targetting those who need the services (and I don't think it's just those on benefits). I've spoken to so many people who just don't know they exist. They're usually handed something by the HV in the early weeks of having their baby so don't take it in. Perhaps they should have weigh in clinics there (ours are held in the GP surgery - they could easily be in a CC).
I really find it sad that this government is cutting so much which relates to mothers and children. I find myself denying that Cameron is PM because of the damage he will cause to our society. And I'm getting so bored of the "but he has to rectify what Labour did" chants. Yawn. Big corporate profit hungry banks screwed us big time. Yet I don't see any increases in corporation tax, any clampdown on tax evasion (which costs more than benefit fraud at approx £15bn for evasion vs. £1bn for benefit fraud). Sickening.