He won't get drafted but he can be an NBA player if he wants it badly enough. He has the potential, athleticism, and a well-rounded offensive game; maybe once millions of dollars are at stake and there's no "one more year of college" to fall back on the lightbulb will click. Also, as much as we all love Hurley, he's had limited time with Jalen (we all know that KO oversaw almost no player development) and NBA coaching is the best in the world and might help Jalen develop the parts of his game that need it the most.
I agree with others that his ability to get to the FT line is an issue. Given how much he has the ball in his hands it's insane he only averages 2.5 FTA per game for his career. He's at 2.7 per game this year. A small part of that can be blamed on Ollie and our non-existent offense (I'd blame his FG% on that more than FTA) that Jalen had to be in for three years but the large portion of it falls on his own shoulders.
By comparison to other recent guards...
Kemba averaged 5.8 for his career (7.7 his Jr year)
Shabazz averaged 4.4 (6.0 his Sr year)
Boat averaged 4.5 (4.9 his Sr year)
All good offensive NBA players seek and create contact (to the point where it's laughable what the NBA lets guys get away with these days). Jalen is an acrobatic finisher who makes some very tough shots around the rim but he's not good at drawing contact and getting the line. Sometimes simple is better.
That said, I think he has a cup of coffee (if Purv and Hamtilon have, there's no reason Jalen shouldn't) and believe he may surprise some folks. He navigates the pick-and-roll game well (he's got a nice slitheriness to his game), isn't a selfish player, and can score as well as pass. His shot needs work but isn't broken. You get him in the wide open, spaced out NBA game surrounded by shooters and some good things might happen. His biggest challenge is that he doesn't have overwhelming gifts by NBA standards--in terms of skill or athleticism--so he now has to make up for it by out-working people. By and large he has coasted by in college by being more gifted than the competition. He's never had the intangibles that Kemba or Bazz had; will he amp things up and change his stripes once dollar signs are dangling directly in front of his face?
I also want to believe that our string of NBA point guards will continue. AJ, Kemba, Bazz, and now Jalen. Jalen has more natural gifts than AJ or Bazz. If Jalen fails to have an NBA career he'll be our first really good PG who didn't make it since KEA.