I enjoyed seeing The Invasion with the animation as it was. I agree with the sentiment that it shouldn't be a reconstruction. The quality of animation was good enough for me. And, it made all the difference for being able to watch the story in its entirety. I'm looking forward to the same with Reign of Terror.
If we keep the quality level constant at Reign of Terror levels, the price for the quality will decline over time. At some point, the price should be low enough to make it profitable, unless there's just no market for mostly/completely animated stories.