I think games development needs TGA support...
Working for a major game developer (EA) as a director, although it is admittedly an archaic format, TGA is an essential format for day to day use.
This is a format that although we do not necessarily manually write too, it is the way we store the image in its raw format and I suspect many other studios do too. Higher depth formats are becoming more prevalent, but for now TGA is an essential format that without, we could not recommend the software rollout.