@Matt, wow, playing with Dave Holland must have been great. He's a perfect example of the contemporary bass player.
I'd have to ask you about contemporary Brazilian Jazz, since the bossa department is rather "spartan". Especially for the bass and drum comping in real styles. Lack of variety again. We would all benefit from some young blood...
@Journeyman, the risk of new styles being too tune specific and not for general use is very true. Jazz rhythm sections tend to play more melodically, or, as you put it, they respond much more to the dynamics of the tune or the soloist.
Nevertheless, Brad Mehldau's 5/4 arrangement of 'I didn't know what time it was" could be used on many tunes. Christian McBride's modern bebop comping style could fit lots of bop tunes. Eric Harland's mid tempo swing would render lots of old chestnuts into fresh vehicles for improv. Elvin Jones influenced a lot of young drummers, his styles could bridge the gap between the old and the hyper young.
Every contributor here, thx for interesting debate.

Biab, Kontakt, Sampletank and lots of nice libraries, from Fluffy audio to Abbey Road drums.
Check out these great contemporary Jazz Styles: www.jazzstylezz.com