FYI, there are two things being discussed here. There dataset linked in the comment above is for Brood War. The headless client released today is for SC2.
I am aware of that. The point remains the same: both Brood War and SC2 are expensive to run, so you really don't want to and it's worth spending disk space to cache the results of playing out a replay files. This will probably also be true of the replay files DM/Blizzard will be releasing even with the lite client.