I've always regarded the distinction between Hymns and Worship Songs as a false dichotomy, because a worship song is, by definition, a hymn. Neither do I see any fundamental difference between contemporary hymns and traditional ones: today's style may be "now" but will soon be history, while "tradition" is built on layers added to by each succeeding generation including our own.

There's really only one thing that sets contemporary hymns apart, but it always has done in every age, and it's unavoidable. Essentially, most of what's written is rubbish (Sturgeon's Revelation), most of the rest is mediocre, only a tiny fraction being really good. The rubbish soon gets consigned to the dustbin of history, within a generation say (things happen slowly in a church whose sights are set on eternity), the mediocre lasts long enough to become old-fashioned before going the same way, while the good stuff survives as Old Favourites.

The only distinctive thing about today's hymns is that they have yet to go through this filtering process, and the rubbish is still with us.