Tsuji could do many things, but we have seen many brilliant results in mice and what not that didn't translate well into humans, and that is what Tsuji still need to prove. Do they have the knowledge and resources to reach those results in humans or not?
No matter what, Tsuji is far away in the horizon, even if they got started next month, they still have the whole cell multiplication process and so on, and make sure that doesn't end up with cancer cells and so on which there will be a high risk of when doing cell replication in big scale. And we haven't heard anything about optimization in how to Tsuji avoid that hurdle within cell multiplication for hair cells.