Quite obviously. Of course, one may hope that IBM will support their existing customers, but they are not really developing the product anymore.
Just look at the v8 non-release!
One other symptom is that ClearCase is in fact a poor plugin in the version control slot in RTC, which is better suited for e.g. Git.
Of course, I have shown for the past 10 years that Rational took with UCM a deadly strategy, doomed to fail because based on a bad design. This has led IBM to more or less drop the most sophisticated and interesting parts of ClearCase: dynamic views, clearmake, MultiSite... UCM makes no use of them, on the contrary: it is best suited for a centralized hub accessed with web clients using snapshot views.