I read something the other day that stated that HIDS was different than HIPS in that it utilizes signatures as well as behavioral analysis. Based on that you could say that Comodo Internet Security, ESET, and Emsisoft are HIDS?
The border between them is too close. It is now to see will Comodo dilute HIPS and go in for an automated BB so that new users or noobs can use it or it retains its classic HIPS system.
Maybe a Hybrid would do good. Maybe kaspersky's system watcher can be called an HIDS as it also monitors network traffic by applications.