I don't see OWN around for the long haul.
If OWN were to eventually go away, it would be interesting to see what Discovery would re-brand it as. Their recent efforts have been decent - Discovery Times to ID has been quite successful, and I think Destination America, the upcoming Planet Green replacement, will do well for them also. The combined FitTV/Discovery Health isn't bad and makes more sense. A history-themed channel would be interesting, but they tried that with Discovery Civilization in the 90s.