KDE is a free software project that lives from voluntary contributions. Everybody is encouraged to contribute to KDE. Not only programmers are welcome. There are lots of ways in which you can help to continue KDE:
Testing the software
Sending in bug reports
Writing documentation or help files
Translating programs, docu and help files
Drawing nice icons, composing sounds
Writing articles and books about KDE
Programming new KDE applications
Of course, sponsors are also welcome :-)
There are several places to look for more information if you want to get involved in the development. The first step is to subscribe to some of the mailing lists. You will soon see something that can be improved or added.