LaVar Ball was reportedly looking into LaMelo (a high schooler) and LiAngelo (who just left UCLA) playing together overseas.
With the younger Ball brothers signing with Lonzo Ball's agent, there's no turning back on that plan for college basketball.
There's still the matter of finding an overseas team willing to sign LaMelo and LiAngelo and deal with everything LaVar brings. But signing with an agent immediately ends college eligibility.*
*It shouldn't. Young players should be allowed to retain professional advisors. But that's not how the NCAA - which seeks to enrich coaches and administrators, not athletes - operates.
LaMelo is a serious prospect for the 2020 draft (or 2019 if the NBA changes the one-and-done rule by then). It'll be interesting to see how develops on a foreign team and how NBA teams assess his progress. He's a talented scorer, but his all-around game needs development.
LiAngelo looks unlikely to reach the NBA regardless.