Depending on your definition, in jazz, I would say there are a few who might become/already are legends: Branford and Wynton Marsalis, Joshua Redman, Brad Mehldau, Christian McBride, Dee Dee Bridgewater, Pat Metheny, John Scofield. Maybe also John Patitucci, Dave Weckl, Bill Charlap, Larry Goldings, Peter Bernstein, Bill Stewart, Brian Blade, Kenny Garrett, Kenny Barron, Bill Frisell. I tried to pick the bigger names who do a lot more touring internationally and who I think already have some wider visibility, rather than some of the (perhaps) lesser known players like Mike LeDonne, Chris Potter, Eric Alexander, Sam Yahel, Andy Gravish, David Hazeltine (who are all still phenomenal of course). I think Wynton and Branford, Mehldau, and McBride all have pretty visible profiles.
Absolutely! Maybe also Jonathan Kreisberg for guitar.. oh and on piano how could I forget Benny Green! I kind of feel he's not as big as he should be. Another pianist who I really love and took a few lessons with in NYC is Bruce Barth, also sorely underappreciated.