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.

Very nice suggestion.
We appreciate if a team start developing a way to support backward compatibility if CI4 or individual development of Codeigniter version 3.
Some of the users are not as good as you guys in terms of in depth Codeigniter development. only the end users of this amazing products.
I couldn't help you before. So don't take my request as being rude.
I love Codeigniter and so far, it's been great for my website.