There is a lot of hype about how IDS is being replaced by IPS but here is an article that believes IDS products will still be in demand 5 years from now while IPS will be mostly part of firewall products
http://searchsecurity.techtarget.com/original
Content/0,289142,sid14_gci1268979,00.html?track=sy160&asrc=RSS_RSS-10_160
[Editor's Note (Valle): Most customers are still wary of putting their ASAs or IDS products in IPS mode. As more network attacks circumvent signature-based defenses, the real value of IDS comes from their ability to do deep packet inspection and report to SIM/SEM devices like MARS which in turn can activate mitigating instructions within the network.]
