Your question is much more complex than can effectively be handled in this Q&A system. help.openstreetmap.org is aimed at finding the "single best response" to a clear question; you should really post your question on the talk mailing list or the forum for a broader discussion.
Having said that, tracks are just the groundwork upon which a map can be built. Building the map is usually a manual process. Your assumption that "automatic mapping from tracks is the only method to get useful maps for upcountry Africa and other developing countries" is a common fallacy; the same reasoning is used by some people to argue that we have to import third-party in some areas because "there will never be somebody to do all this work". The problem with that is that a body of data in itself is close to worthless; we also need the community to maintain the data. Without the community, we might as well not import (or auto-generate) the data in the first place.
That's why we don't do automatic track-to-map conversion.
The answer to your question is: Yes, do upload the tracks, and where possible and where time permits, manually make a map from them; even if you don't have the time, your tracks might be useful to somebody else who e.g. combines them with aerial imagery to get an idea of the situation on the ground even if he lacks the first-hand knowledge that you have.
But as I said, your question has several interesting aspects that go beyond the simple structure of a question-and-answer system. [Do join the mailing list.](http://lists.openstreetmap.org/listinfo/talk)
