It's an interesting idea but if I have to be honest it gets boring after a while as there doesn't seem to be much difficulty (unless it gets progressively harder as time passes - I stopped playing after about 3 minutes of corpse eating).
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I decided pretty early on that when the fishing boats successfully kill a decoy shark, they ALL should assume they caught you and leave, just like what happened in the movie. So if all you have is one decoy shark, it doesn't matter if you have 2, 3, or 30 fishing boats after you. If I hadn't stuck to that decision, then what you're saying would have been a much more feasible option. I wish I hadn't done that. Your suggestion sounds like it would have improved the game a lot. Oh well, lesson learned.
It's okay, it was just my opinion, maybe others will have different opinions than mine, don't feel bad about it!
And yeah, game design documents are supposed to be always changing, maintaining the original idea is fine but mechanics should be changed if you notice they aren't working as intented or aren't as fun as you thought (imo)! :)