I believe the OP was referring to the fact that if you are replacing a RDBMS with a NoSQL solution then chances are the RDBMS was not really a good choice in the first place. If you need the CA section of the CAP triangle and can't pass a possible inconsistency to the application level then a RDBMS on a big honking box with master/slave replication is probably your best bet -- a lot of the NoSQL traction has been in providing solutions to people who don't specifically need that part of the equation but fell into a RDBMS because it was the default/traditional solution to "I have some data, now how do I access and store it?" question or because they did not know that options which relaxed consistency assurances were not quite the heresy their DBAs claimed.