He is now the prime minister of a Bitcoin micronation called Liberland
https://www.dlnews.com/articles/people-culture/tron-founder-justin-sun-elected-prime-minister-of-liberland/
Good for him. As far as I know, he left the TRON project quite some time ago. So it doesn't matter what happens with him. The project is in the hands of the community, and should stay that way for its own good. Justin Sun's departure should make TRON look more decentralized than ETH. The latter is still tied to Vitalik Buterin. Now that Justin became the Prime Minister of Liberland, he can propose the migration of the country's currency into the TRON blockchain itself. It would greatly benefit TRX in terms of market price and mainstream adoption/demand.
While TRON isn't as popular as other chains, it's still the top choice for stablecoin transactions. I'm hoping developers bring something new to the table, just to make TRX shine among its competitors. SOL is eating TRX's cake with the "meme" coins hype and all. It's also faster and cheaper to use (if I'm not wrong). Without innovation, TRON will just become another "meme" coin like Dogecoin and Terra Classic. It's an uncertain future, so I'd hope for the best.