The overwhelming majority of MLS next players will not play beyond the college level, if even that.
Well they will find that out now younger on that potential dead end. U17 end of that for MLS locals. if you haven't been promoted out of NEXT or training with the men by U17 your chances would be gettng slimmer.
NEXT for non MLS is not that much different vs some of the other club leagues, lots of potential for exposure or recruiting but maybe not as big as ECNL with all the events they run. NEXT playoffs has some good numbers buts it's end of year so likely only prime for juniors or sophomores.