The effort is laudable, but ultimately futile. The world has moved on from Java on the client. It is now largely relegated to a backend language for enterprise applications. Nobody really wants the heavyweight mess that is the JRE on the desktop when other frameworks do a better job. There was a case for Java-based desktop apps in the 1990s/2000s when browsers were slow, desktop UI toolkits were generally terrible and lacked cross-platform capabilities. But this was then and now is now.
So no, a new UI toolkit is not going to revive Java in the mainstream.
So no, a new UI toolkit is not going to revive Java in the mainstream.