I personally see no reason to change the downvote cap on points. I'm order to even abuse this, you would need at least 4 downvotes on a single post (I believe 4 is the limit, but I could be wrong). I believe that this is highly unlikely in its own right, but there is one main reason I think there is no reason to change this.
In order to benefit by something like net + 50 points, you would need to receive 9 sympathy upvotes on an answer. You need 5 sympathy upvotes to even benefit at all (getting a net +10 points). To me at least, this seems very unlikely that this would occur at all. To benefit even greater, so many bad answers would have to be posted that you would get banned before anything could be accomplished. It just seems like a lot of work for basically nothing in return.
I calculated Blaziken's points. For a total of 90 answers, they have appeared to have gained 20 points (Calculating normally, they ended up 20 points below their point total. I also believe it's much more likely that they recieved more than 4 downvotes on an answer, so that's why they have more points, not TY's theory of abusing the cap.