There are rumours that positron is being resurrected, in the wake of jahshaka’s demise.
Not only would this potentially expand blender’s versatility, it would fill a gaping hole in the OSS graphics world.
Positron’s return is only a rumour, though. Until we see some releases I would whole heartedly encourage your script based idea.
Blender is very versatile, but with versatility comes complexity, and with complexity comes a potentially slower workflow.
Until this issue can be overcome, I’ll stick to using AE (and Flint) for motion graphics and compositing.