The challenge is massive. They can take staff from the big consultancies but these people will be expensive and hard to retain. Someone said to me the other day that "consultants that have two kids at private school and drive Bentleys will not move for less money?"
That is not the only challenge. The big players such as Accenture, Deloitte, IBM etc have the bank balance required to buy the skills they need and stay ahead. This was demonstrated today by Deloitte's acquisition if identity management specialist IM Global.
It is harder to integrate high end consultancy skills into an IT organization than the counter.