Q: Why is GStreamer written in C ? Why not C++/Objective-C/... ?

A: We like C. Aside from "personal preference", there are a number of technical reasons why C is nice in this project:

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C is extremely portable.
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C is fast.
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It is easy to make language bindings for libraries written in C.
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The GObject object system provided by GLib implements objects in C, in a portable, powerful way. This library provides for introspection and runtime dynamic typing. It is a full OO system, but without the syntactic sugar. If you want sugar, take a look at Vala.
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Use of C integrates nicely with Gtk+ and GNOME. Some people like this a lot, but neither Gtk+ nor GNOME are required by GStreamer.

So, in closing, we like C. If you don't, that's fine; if you still want to help out on GStreamer, we always need more language binding people. And if not, don't bother us; we're working :-)