I know a little bit about this. The uptake nationally hasn't been great - my experience is that it's because there is still quite a bit of resistance from medical colleagues about non-medics taking these roles. There's also a real problem with payment - some Trusts have negotiated extra sessional payments for AC / RC duties but others haven't been able to do this. I think the extra responsibility without the extra pay will put people off.
My feeling is that it's a good thing for CPs to be able to do, and is an extra skill set to draw upon and bargain with when posts are under threat - however the counter to that is that there may then be an expectation for consultant CPs to do RC duties on top of their day job. I think a lot of people may rightly have objections to this becoming a part of the role they haven't opted for.
Hope this helps.