That is not how KDE works. KDE is not a company and it doesn’t absorb or embrace other projects. If you have a project you would like to develop using the advantages afforded by KDE, you can put it through the incubation process and then, when it passes, work on it yourself. The other KDE contributors that join you (if they join you), do so under their own steam. There is no management telling people where to go or what to work on, so if you stop working on your own project and have been unable to attract other contributors, development will stop.