Steve Baczkowski is young-ish, yeah. Probably around my age I'd guess (45).
JBL -- it depends on the situation but I booked him for a duo with Luke Stewart that was tremendous, and have also enjoyed hearing him with Alan Braufman, Cooper-Moore, William Parker, and others. Jesup Wagon is really super too.
Laubrock is rad but I'll admit not totally being stoked on more arch-seeming recent projects. I think that if those grow it will take a little time / rear view mirror. No knock against Tom, who's one of the best living jazz drummers without a doubt, but I do have fond recollections seeing her duke it out with Tatsuya Nakatani once. I'd be interested in hearing her with other percussionists more often.