He can do it, but obviously, it should be in secret as part of his agreement with the government is that he should not go back to the helm of Binance. And with that, I think that CZ will do another project that is related to crypto, it could be a new coin or token. Something that will get him back to his roots as we all know that in 2017, he made this groundbreaking exchange and made it as the top in the last 5-6 years
In near future, it is unlikely to happen if CZ did not change his mind. Months ago, before stepping down as Binance CEO and going to prison, he revealed that he has no interest to make another business.
Frankly, no one can deny the great success that CZ has achieved in a relatively short period of time. It is not easy at all to transform Binance from an unknown exchange in 2017 to the most important and largest exchange at the present time.
CZ and Binance team took advantage of unprofessional services and customer cares of Poloniex and Bittrex to join this market and quickly attract massive users from these two exchanges. They were very smart to create the BNB token, run massive airdrop to attract users and with smooth service that was barely seen in 2017, they turned Poloniex and Bittrex to Tier-2 exchanges within several months.
Despite the many criticisms of Binance that it is turning crypto into centralization by swallowing the market and extending its arm to all crypto services in a centralized manner, but in the end we can only respect the man and admire all the achievements he has made. But I think that his departure would be better for Binance and the market.
The rest is what you said, they became a biggest centralized exchange and create many trends in cryptocurrency market since 2017. BNB token is a first trend they created, and other centralized exchanges learned from it to launch their own tokens. People can dislike CZ and Binance but the fact is it's hard to find other centralized exchanges that can create hot trends in crypto market like Binance.