Will development of CodeIgniter 3 continue? Or who will continue it?

I appreciate and encourage the development of CI4. To remain CI alive, development and future adaptation is a must. But CI3 is continuing for a long time. The architecture is different from the two versions. It will be easy to start with CI4 for a new project but will not be easy to upgrade from productive CI3 to 4. That's why CI3 must be continued to develop/maintain at least for a certain period of time may be 3 to 4 years at least.